Malicious PDF — malware analysis report

Static analysis result for SHA-256 a878188cf046a5c9…

MALICIOUS

PDF

43.2 KB Created: 2020-09-06 22:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e83f1d754055d07791a765a6b61c5432 SHA-1: 3b300ef9fc57baa1e94e2ec0ccc6b10e91547cf7 SHA-256: a878188cf046a5c93124a63dddaf6ae70475835cf9f1aef361f105c8f3c91d74
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. One of the primary links, 'https://ttraff.me/wix?keyword=cremorlab+sheet+mask', is flagged as malicious. The document body, though heavily obfuscated, contains references to 'Cremorlab sheet mask' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of many Shopify links, while individually benign, contributes to a link farm tactic.

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.me/wix?keyword=cremorlab+sheet+mask
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/nulobofetufifine.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4560/files/situdemejukul.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6273/files/lijino.pdf
    • https://static.usrfiles.com/ugd/66c878_930d20a4f3e641878907ac206c768e36.pdf
    • https://static.usrfiles.com/ugd/3225da_40b3c15e0cc54337993bce334bb571f4.pdf
    • https://static.usrfiles.com/ugd/6f58fb_6a79933f9a7b4e8a923004188acf77da.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/97795364786.pdf
    • https://cdn.shopify.com/s/files/1/0432/5638/1597/files/delevenowovewelosob.pdf
    • https://cdn.shopify.com/s/files/1/0439/0567/9528/files/assemblies_of_god_nigeria_sunday_school_manual_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/6663/0037/files/52716297557.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8848/files/best_video_player_android_no_ads.pdf
    • https://cdn.shopify.com/s/files/1/0436/0588/5090/files/81576045445.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/le_petit_bourgeois_gentilhomme.pdf
    • https://cdn.shopify.com/s/files/1/0435/1308/6106/files/71297808420.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/casing_capping_wiring.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/
    • https://cdn.shopify.com/s/files/1/0436/0588/5090/fi

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d61.bin
2d4013ca15ad721f89152ef8219eff42dfd6f9fc43937afaba07a27c81da9e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D61 4788 bytes
font_01_sfnt_off00006da1.bin
8465211008362d8d31e1c7072d742f6b19fbb537108ed6a7c336430670111a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA1 10564 bytes
font_02_sfnt_off0000918b.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x918B 4324 bytes

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