Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7b21251735d9e0…

MALICIOUS

PDF

37.2 KB Created: 2020-08-14 21:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64df8dec706dcde3d8bb0bec7cf8a278 SHA-1: f7eda58542a6ce21828d0ecc7ce6bb8cf523fbd1 SHA-256: 5f7b21251735d9e018e355492f4ed2bc21346598960df261657e49e030508cea
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body also contains numerous links to PDFs hosted on Shopify, suggesting a link farm or SEO poisoning attempt to drive traffic to the malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wb?keyword=compress%20pdf%20less%20than%20500kb%20online
    • http://files.soulsistersphotography.com/uploads/1/3/0/8/130873893/275679.pdf
    • http://files.sfhsfbla.com/uploads/1/3/0/7/130775934/xovix_sevabijuburezaj.pdf
    • http://files.lonsdalepark.org/uploads/1/3/1/3/131381681/rixadebemugu.pdf
    • http://files.fldancecenter.com/uploads/1/3/0/8/130813095/zesawupafepa.pdf
    • http://vijobe.saraswatiadornments.com/uploads/1/3/1/4/131482975/zilexigufutidit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/tabupazelefakutude.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5558/files/45647252913.pdf
    • https://cdn.shopify.com/s/files/1/0430/3106/8825/files/smt_apocalypse_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56751463133.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5923/files/how_to_play_botw_on_cemu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/rixolorala.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/temokad.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9201/files/ambedkar_books_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0439/4093/7896/files/83516035278.pdf
    • https://cdn.shopify.com/s/files/1/0437/1863/9765/files/catalogue_pompe_caprari.pdf
    • https://cdn.shopify.com/s/files/1/0428/3092/1895/files/kujot.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/11695815755.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051d0.bin
229f41f81c021a45f54ba6bcca9e67e4bd50f9437d41fc49a67d6764e0b34d6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51D0 5656 bytes
font_01_sfnt_off000064de.bin
a5059f45c26df25fe3772c902304a2a9ae7ae1a4b33baae67287d5cb845c2218		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DE 10096 bytes

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