Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c6a57a924d27d2…

MALICIOUS

PDF

42.1 KB Created: 2020-08-15 01:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11a09c67b984130c4fbd791985c23921 SHA-1: 53a8ffc66366f2da93ee568cadb8702de6da29ee SHA-256: 41c6a57a924d27d2ece0b2819a28e3efe191d63f9a7e2ed241127cca21d5a3e7
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to a 'free 2019 yearly calendar with holidays' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=free++2019+yearly+calendar+with+holidays
    • http://gusufigu.stbleagues.com/uploads/1/3/2/7/132741155/pafigenixagofomuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/wisetunidosezobubuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4335/6821/files/tasixodul.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/gbatemp_wii_u.pdf
    • https://cdn.shopify.com/s/files/1/0431/8933/8276/files/62013727762.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/pesotulo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9712/0154/files/39137860602.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/clinical_chemistry_tests.pdf
    • https://cdn.shopify.com/s/files/1/0432/9141/0596/files/kubewovedamiraso.pdf
    • https://cdn.shopify.com/s/files/1/0449/7742/2494/files/vert_shock_workout_free.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_off0000651c.bin
5fa68b1426ac999823d19b3002bfab4ccd581fc0f630ec3ebca1a9cc949d69a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 5656 bytes
font_01_sfnt_off00007868.bin
f63b026d461b3e0688ad327a0866b08634c20f4bee4b985f4ac0b0368019d88e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7868 10472 bytes

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