Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f57ecef90821b08…

MALICIOUS

PDF

41.4 KB Created: 2020-08-22 20:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ec40a05b62b0077065c7a268a20f109 SHA-1: c020778c8832c3dc702e75cae7dc8b0fac0bb71e SHA-256: 5f57ecef90821b08449f8e315eb31df3633950553a893bc0a6fe5cbcb40a2053
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector known to host malicious content. The document body, though malformed, contains a URL that is also present in the link farm, suggesting a coordinated effort to lure users to potentially harmful sites under the guise of design resources. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=round+sticker+mockup+psd+free
    • http://mamufodip.operationhood.org/uploads/1/3/1/3/131384429/tuxegupunu-davefupikabazed-fomon-damokemelom.pdf
    • http://files.mayvalleyvet.com/uploads/1/3/1/4/131437242/welatefulaj_xadosav_kulunufi_dejemovofa.pdf
    • http://files.markcramerartist.com/uploads/1/3/2/6/132681362/nimoke.pdf
    • http://files.sylvielouagie.com/uploads/1/3/2/3/132303045/a596d5d.pdf
    • http://files.4l4lionsstore.com/uploads/1/3/1/4/131482954/7881346.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/toxugafama.pdf
    • https://cdn.shopify.com/s/files/1/0434/9716/0866/files/posenomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3769/5895/files/25157674909.pdf
    • https://cdn.shopify.com/s/files/1/0431/2173/7882/files/93046969142.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/reliability_and_validity_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0429/4849/3475/files/ninowopulaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/7708/0990/files/68500_revised_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/6762/2055/files/life_anubhavinchu_raja_songs.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7469/files/3507877987.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7462/files/85085291017.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/55946002385.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/noveromobipi.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_off0000648c.bin
830e4a8edc7c50b2b974b9d6b32c58e46005804187f9bdb1442582dcf71665b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648C 5132 bytes
font_01_sfnt_off000075f5.bin
a8cfaacc03a8fe3abc4bcf438cfc37aacb6a26e2371dd4e87c0ebbda9aa3f28d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F5 10076 bytes

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