Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed77e255b34900a…

MALICIOUS

PDF

32.6 KB Created: 2020-08-06 07:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a815e5d1a31df18bceeab9a94a8ab3bd SHA-1: 3e0a632689d817e6b1600b1837e939a5c2757637 SHA-256: fed77e255b34900a322ff06a174d9800fcaa7c57ab5112db215fef90b473b3a2
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Mercedes v class brochure pdf' and includes the malicious URL, suggesting a lure for phishing or malware delivery. 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.ru/pify?keyword=mercedes+v+class+brochure+pdf
    • http://lawavul.customglassandgranite.com/uploads/1/3/1/3/131381428/61cb3dcba7c5cd.pdf
    • http://files.nutrition168inc.com/uploads/1/3/0/9/130969062/vusavetuxidamak-jeritexofademut.pdf
    • http://tupolej.bestitalianvacations.com/uploads/1/3/0/8/130874493/vanofivuso_mabunuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/3859/7539/files/94282332437.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/14561899619.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6343/files/42205245448.pdf
    • https://cdn.shopify.com/s/files/1/0436/6345/8457/files/xesatomagisijakofabo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/buwafari.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/siwar.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/rename_files_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/88254211870.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/tolada.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4702/files/acgih_2020_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0447/5761/4741/files/isomerism_notes_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/33238264978.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/lurotisanat.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_off0000434c.bin
3dcdf52c6731ab1c3e5e736ba932952826dd389f969b17fbe495342fb8470d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x434C 5448 bytes
font_01_sfnt_off000055d9.bin
8dd6b2279b14761178d3bd6657c9dad385dd18f9926936eab2a1187589ce166f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55D9 9268 bytes

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