Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b27b78ec2cf970…

MALICIOUS

PDF

68.2 KB Created: 2020-08-24 00:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc36b59fcaf4216aae873428d2055a2b SHA-1: 21a7039a35ee9ac1c524993ae7c8fd4e1115e7b8 SHA-256: 05b27b78ec2cf970722c161e5a81a4165633b347ed7cd6d384d8098b44bcab4f
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that lead to a redirector service, which is a common tactic for distributing malicious content. The document body, though heavily obfuscated, contains references to 'american diabetes association guidelines type 1' and a malicious URL, suggesting a phishing or scam attempt. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links further supports a malicious intent, likely to drive traffic to malicious sites.

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=american+diabetes+association+guidelines+type+1
    • http://files.merjomarine.com/uploads/1/3/1/3/131380875/jeninu.pdf
    • http://dibonegad.tapcater.com/uploads/1/3/0/8/130874038/4c0e025f.pdf
    • http://lewevej.laurengracesmith.com/uploads/1/3/0/8/130874284/a5efd8ef37b79f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/leladikunudigeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/98182730666.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3593/2310/files/artistic_arabic_calligraphy_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/6943/1189/files/baal_veer_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1675/files/jowodoneluxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9154/9590/files/49550437730.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jewepogepavab.pdf
    • https://cdn.shopify.com/s/files/1/0465/0473/8966/files/49953585620.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/adversarial_machine_learning_yevgeniy_vorobeychik.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/namobujolazademibakituka.pdf
    • https://cdn.shopify.com/s/files/1/0438/9509/5464/files/burofisivule.pdf
    • https://cdn.shopify.com/s/files/1/0432/2154/9217/files/brahmanand_bhajan.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_off0000ca5c.bin
cc4e03ff0ad2de39d39524753431117b8f9f324165afb48a7437b020b8966fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5C 5676 bytes
font_01_sfnt_off0000dd8e.bin
e822cf3c01fde037d8465050d50a4152c344e0b71e464bb59101e707a552b052		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 11392 bytes

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