Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd43807b2405529…

MALICIOUS

PDF

59.2 KB Created: 2020-07-13 23:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 7e904edc389f99e3dcd6256ebacde515 SHA-1: f296f56e3f1cbf1e34c5c4e323ddaaf57e18897e SHA-256: efd43807b240552965da9da7be45fc2280579e8968784bd06b22c4e1ffdbcb85
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf. The primary malicious URL identified is ttraff.com, which is used in conjunction with a keyword suggesting a lure for a manual. The file also contains a large number of embedded links, many pointing to WordPress-hosted PDFs, which is indicative of a link farm or SEO poisoning technique.

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.
  • 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.com/wb?keyword=aristel%20av%20series%20manual In PDF document text
    • http://files.socainvasionweekend.com/uploads/1/3/0/7/130775520/zexijezavopev-warugibebovali-jatufamibowed.pdfIn PDF document text
    • http://files.metis8.com/uploads/1/3/1/3/131383673/2457581.pdfIn PDF document text
    • http://files.discovery-wellness.com/uploads/1/3/0/7/130776680/1558448.pdfIn PDF document text
    • http://files.aspectsofdance.ca/uploads/1/3/1/3/131379181/zefudiwopogov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sokoson.files.wordpress.com/2020/06/xowivogekisib.pdfIn PDF document text
    • https://nolifajidame.files.wordpress.com/2020/06/39307584065.pdfIn PDF document text
    • https://ruvirimijoxi.files.wordpress.com/2020/07/21295807932.pdfIn PDF document text
    • https://wozokaju.files.wordpress.com/2020/06/dalawuvajazi.pdfIn PDF document text
    • https://zijumaxiwigu.files.wordpress.com/2020/07/83746637260.pdfIn PDF document text
    • https://rokalapab.files.wordpress.com/2020/07/wozodadalazuxasasuvofuxag.pdfIn PDF document text
    • https://dobevilegexe.files.wordpress.com/2020/07/pebisabapujeto.pdfIn PDF document text
    • https://keligimeb128609187.files.wordpress.com/2020/06/meriwotivixufos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30899714004.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3218030698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/riwiborajibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/sajaloxirogariviwotan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FC3 4652 bytes
SHA-256: f2058c0be24866902a9a348d9d91a4cc5ba2d0bd1ffe811c32dc8ee334d72034
font_01_sfnt_off0000af65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF65 15608 bytes
SHA-256: 965cef898418b2f166451c091e1d64536a159b9d2bcc33bd038fa21c8ae42e52