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)
MD5: 5b25db688b3e5063f6c9161abcc79565 SHA-1: d0ce679ac92d4aa1f044b79fc23dfdefe38e9ecc SHA-256: 77da32391005e920b001e08f08c63151f67fd1cd87ce6d9281860c4ad01aa042
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to lead users to external websites. One critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/pify?keyword=lagu+koplo+kartonyono+medot+janji+adella, which likely serves as a gateway to malicious content. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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
    • http://files.helpurchild.net/uploads/1/3/1/3/131398529/zetikigoxejoduwu.pdf
    • http://files.centralfloridarowing.com/uploads/1/3/1/4/131437655/debodob-rupuvagarapi.pdf
    • http://files.multiculturalassociationsussex.com/uploads/1/3/1/3/131398131/sezasa_pirapor.pdf
    • http://files.shemewe.com.au/uploads/1/3/1/4/131455247/159df0cad2d5.pdf
    • http://files.troutbum.ca/uploads/1/3/2/7/132710655/046c6686a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/waxujebe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/66426389660.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/savowogofoxifonikili.pdf
    • https://cdn.shopify.com/s/files/1/0433/5697/9351/files/british_english_to_american_english_words.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/sesiwukiserelenugeporujot.pdf
    • https://cdn.shopify.com/s/files/1/0446/4531/8819/files/biosynthesis_of_digitoxin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5349/8019/files/zotero_annotation.pdf
    • https://cdn.shopify.com/s/files/1/0431/3369/8209/files/puxojejekawubifenubiti.pdf
    • https://cdn.shopify.com/s/files/1/0436/0660/5987/files/30163989667.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/arduino_uno_tutorial_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0433/5825/7306/files/sodikirezujofumenogijedix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

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

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