Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc9fcba04d81f58…

MALICIOUS

PDF

43.6 KB Created: 2020-08-16 19:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a513a5578df049c25f5becfd01ed4249 SHA-1: 7b9973309d145133300257f01d0fe6b3b3d58e24 SHA-256: 7dc9fcba04d81f58288096fa7671faa87ea616a78bef909daed014508ec0e035
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=active+and+passive+voice+practice+test+pdf'. This suggests a phishing or scam attempt, masquerading as a practice test to entice clicks. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded malicious URL is a high-priority indicator.

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.ru/pify?keyword=active+and+passive+voice+practice+test+pdf
    • http://files.healthybodyhappyhearts.com/uploads/1/3/1/3/131381658/9398549.pdf
    • http://files.atholtonmusic.org/uploads/1/3/0/7/130776787/279915b1.pdf
    • http://files.edncf.org/uploads/1/3/0/8/130814118/ab9753.pdf
    • https://cdn.shopify.com/s/files/1/0432/2207/3508/files/22018584789.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3952/files/22755282910.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/68140487003.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3643/files/wilisuvudorikigese.pdf
    • https://cdn.shopify.com/s/files/1/0438/1140/5986/files/suwoki.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/31982417840.pdf
    • https://cdn.shopify.com/s/files/1/0437/5091/6247/files/our_lord_calling_your_name.pdf
    • https://cdn.shopify.com/s/files/1/0436/4579/6512/files/60091314689.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/calculus_2_sequences_and_series.pdf
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/emphatic_structures.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/75104933353.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_off000062d7.bin
0016e58cfb67ec21036e10bf947e7c80fa3946f8436e051e2bb6a77d820abdf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D7 5168 bytes
font_01_sfnt_off00007477.bin
2545b659767a04ce989fff5a76cd3ba5dd8dc0e30b22a2ed38295dd839eee4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7477 14084 bytes

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