Malicious PDF — malware analysis report

Static analysis result for SHA-256 7429761bbad65ab1…

MALICIOUS

PDF

46.8 KB Created: 2020-08-01 20:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed62dcef31b4ad85f20545367b9a6259 SHA-1: e26fa80aa78f892329e7707bc43da5d6502407ac SHA-256: 7429761bbad65ab1f9307d6575643320d824263fa7f4dc37df6bda3fb1462ff6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=lil+wayne+carter+4+free+mp3+download`. It also exhibits a high number of embedded links, suggesting a link farm or SEO spam tactic. The ML classifier strongly supports the malicious nature of this PDF. While no scripts were extracted, the embedded URLs and the PDF structure itself are indicative of a malicious lure.

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/pify?keyword=lil+wayne+carter+4+free+mp3+download
    • http://files.preciouspawsdogs.com/uploads/1/3/0/8/130814535/pewijalofododeka.pdf
    • http://files.robinlewismusic.com/uploads/1/3/2/6/132696598/8203362.pdf
    • http://files.californiawineryshuttle.com/uploads/1/3/1/4/131453543/sukipemosakow.pdf
    • http://files.caringinc.net/uploads/1/3/1/8/131871698/suvosekow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9139/2664/files/bameni.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/4902859677.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/62886083383.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokixud.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/zisuwivubewunisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2432/files/leguwimerewasitova.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7777/files/48681395302.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/7600077746.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/vipomapifavuzajizit.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/vidaxutuzazanipinukajabaw.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_off000077ed.bin
5ae23f773f8873a4351df4cddbcc2bfb03b329e939e7ab4cd818dc05bb53f744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77ED 5512 bytes
font_01_sfnt_off00008abe.bin
3b732cd976acc07dac18f7fc3a8dd1401b008f99b7728b0b8c9478db3f9f14df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABE 10232 bytes

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