Malicious PDF — malware analysis report

Static analysis result for SHA-256 77da32391005e920…

MALICIOUS

PDF

42.0 KB Created: 2020-08-20 01:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5b25db688b3e5063f6c9161abcc79565 SHA-1: d0ce679ac92d4aa1f044b79fc23dfdefe38e9ecc SHA-256: 77da32391005e920b001e08f08c63151f67fd1cd87ce6d9281860c4ad01aa042
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to redirectors and potentially malicious content farms, disguised as popular song downloads. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a strong intent to redirect users to harmful sites. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=lagu+koplo+kartonyono+medot+janji+adella In PDF document text
    • http://files.helpurchild.net/uploads/1/3/1/3/131398529/zetikigoxejoduwu.pdfIn PDF document text
    • http://files.centralfloridarowing.com/uploads/1/3/1/4/131437655/debodob-rupuvagarapi.pdfIn PDF document text
    • http://files.multiculturalassociationsussex.com/uploads/1/3/1/3/131398131/sezasa_pirapor.pdfIn PDF document text
    • http://files.shemewe.com.au/uploads/1/3/1/4/131455247/159df0cad2d5.pdfIn PDF document text
    • http://files.troutbum.ca/uploads/1/3/2/7/132710655/046c6686a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/waxujebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/66426389660.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/savowogofoxifonikili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5697/9351/files/british_english_to_american_english_words.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/sesiwukiserelenugeporujot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/4531/8819/files/biosynthesis_of_digitoxin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5349/8019/files/zotero_annotation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3369/8209/files/puxojejekawubifenubiti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0660/5987/files/30163989667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/arduino_uno_tutorial_deutsch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5825/7306/files/sodikirezujofumenogijedix.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000513f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x513F 5284 bytes
SHA-256: 8b206f5378372bcb9c206a2d93791caa5f8a112622fadd064a92b16f8895559f
font_01_sfnt_off00006336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6336 9892 bytes
SHA-256: 99d6660359631a591011626e6e0228de71e7b9c31d73ccb6707e1872d799fa3e
font_02_sfnt_off00008557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8557 16204 bytes
SHA-256: 73bb1f519e29941fc98367ae33a8b679223d41029fbf73fb5c585da9ec8c2502