Malicious PDF — malware analysis report

Static analysis result for SHA-256 5501e7ffcb791e39…

MALICIOUS

PDF

55.5 KB Created: 2020-08-15 12:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c171e4804c6d3ed72fe2d200a116530b SHA-1: 41b2e30e0fa9a9b988854883760a28743b9e5135 SHA-256: 5501e7ffcb791e39c29d25f834b21b463765cc1745446eac21cc887739af2599
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF contains a large number of external links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=polarus+humeral+nail+technique+guide', is identified as a malicious redirector. This suggests the document's primary purpose is to lure users into clicking malicious links, likely leading to further compromise. The ML classifier also strongly indicated maliciousness.

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=polarus+humeral+nail+technique+guide
    • http://files.boardaciousboards.com/uploads/1/3/1/1/131164079/100918.pdf
    • http://tuder.oletownaussies.com/uploads/1/3/0/7/130740141/xemetaloviradizisuze.pdf
    • https://cdn.shopify.com/s/files/1/0431/6554/8708/files/fageguzatokamejidelew.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7682/files/canon_eos_rebel_t7i_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8533/files/38847515947.pdf
    • https://cdn.shopify.com/s/files/1/0436/1761/6034/files/vehicle_registration_renewal_form_va.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29876283886.pdf
    • https://cdn.shopify.com/s/files/1/0433/2693/1099/files/7862378334.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2092/files/livro_biomagnetismo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9550/6592/files/78422375507.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/10438767025.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/84870878436.pdf
    • https://cdn.shopify.com/s/files/1/0441/3063/1832/files/pensacola_surf_report.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_off00009a8d.bin
f497832baa10c30f70b1e144c40ab8cec010f729d33ddcd4dd497d270430e4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8D 5480 bytes
font_01_sfnt_off0000acfa.bin
7216a323ffab00d1f846c1615aff57459d3af6a62e5fe241b5deac7ff206f83e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACFA 10736 bytes

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