Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d26b44fad85b54…

MALICIOUS

PDF

43.7 KB Created: 2020-07-29 20:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1f0152a8b8593c8f633dbb4dfa403fa SHA-1: a0642e6266948859182debe118d886c4766f9d3d SHA-256: d6d26b44fad85b54d5bc121212e28fe8e44a3fd62f47359110cf8bb3ea94d9ec
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with one heuristic specifically identifying a malicious redirector. The document body, though heavily obfuscated, suggests a promotional flyer ('Bilka tilbudsavis pdf'). The presence of a large number of external PDF links, many hosted on Shopify, indicates an attempt to distribute content or redirect users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bilka+tilbudsavis+pdf
    • http://files.withvsat.com/uploads/1/3/1/3/131380627/3455347.pdf
    • http://files.charliedeltajewellery.com/uploads/1/3/1/1/131164063/tekulagafo-betunegusas-misafalo.pdf
    • http://files.westsoundartandmusic.org/uploads/1/3/2/6/132695813/7898684.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bokowolexom.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/37612994899.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2289/files/28575110393.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/37371483000.pdf
    • https://cdn.shopify.com/s/files/1/0435/8507/7405/files/kepemukaraguvokazuwaxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/rorile.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/89771658487.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/xixumivonibufawujugawuza.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/49225836018.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5789/files/rojokepesufadesafol.pdf
    • https://cdn.shopify.com/s/files/1/0438/1730/4226/files/kifedikux.pdf
    • https://cdn.shopify.com/s/files/1/0431/2458/8701/files/30726442188.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f79.bin
4f1f53fb07ba727d5d6527af211a214e14bac2d7dd109e12228665c4616b062b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F79 4800 bytes
font_01_sfnt_off00007fc8.bin
22672935356443605254aa5803ef140d50a6e708b0a8990bc07d2118420f8ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC8 10004 bytes

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