Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ec0c83026c957c…

MALICIOUS

PDF

41.8 KB Created: 2020-08-29 17:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2732e49cf3c17dbf71ebc2efcd1d672b SHA-1: 064270ff58b3ece9508974b7529009e4ac6036e1 SHA-256: 78ec0c83026c957ca800c0b51bd9dd2e7bb6489fc141c7175f8d870d91fe880e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com' with a keyword suggesting a lure for game cheats. This indicates a phishing attempt to redirect users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wix?keyword=grim+dawn+cheat+engine
    • https://cdn.shopify.com/s/files/1/0438/2546/3456/files/ubuntu_source_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89853177043.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/514908197.pdf
    • https://cdn.shopify.com/s/files/1/0435/5401/3336/files/51963208107.pdf
    • https://static.usrfiles.com/ugd/b8c837_40f6f4ca71f74898a515a2598ec36831.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0f66e605a964c489bee53e4186140f1.pdf
    • https://static.usrfiles.com/ugd/77d535_a53a5bc74b2d4367a189cf3245073423.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_db635500abbf47c5a71e66ecee4557f7.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/79611493219.pdf
    • https://cdn.shopify.com/s/files/1/0433/6825/1543/files/pagawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/english_audio_songs_website.pdf
    • https://cdn.shopify.com/s/files/1/0431/6492/6111/files/medicine_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6636/7895/files/off_the_leash_gucci_mane.pdf
    • https://static.usrfiles.com/ugd/b8c837_d522fef8a48d4e3282b1f9b59ca8513c.pdf
    • https://static.usrfiles.com/ugd/09273f_1a335514272e4a03abf401b96f36b5a7.pdf
    • https://static.usrfiles.com/ugd/8b97dd_e8dc2edbc97c4ad48de2e747b9dd2ac3.pdf
    • https://static.usrfiles.com/ugd/b8c837_e74b192ddd1b4f3e8f1d9e7986e3cbf2.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_8fad2ac91eb7402b9cc070182ffc8a53.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006384.bin
f5fd8eea85a7f2d282d26c99fdf5ca355d9c98130aa40d7fa0ca4a42187fc541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6384 5268 bytes
font_01_sfnt_off00007553.bin
a7a1e943c955c6798a055b08d6fd34478a66ddc955610b2c8aa47ff434d08057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7553 11136 bytes

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