Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1adcff02c38b88…

MALICIOUS

PDF

53.2 KB Created: 2020-08-08 03:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37638606cb9408f7444929454298dc13 SHA-1: 902ae0bf979a15e0087a801ff51d9f0a0bb18846 SHA-256: 2f1adcff02c38b88ad9f206c87e2a8dc91014c4e60eda1eaa5a33c15c961c48d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this is a malicious redirector and part of a link farm, likely designed to drive traffic to malicious sites. The document body itself is heavily obfuscated but contains a reference to the malicious URL, suggesting the primary goal is to redirect the user to external content.

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.com/pify?keyword=mecanismo+de+accion+de+los+betalactamicos+pdf
    • http://files.thebarmyfox.com/uploads/1/3/2/3/132303010/xivomuviluj.pdf
    • http://files.treasuresinthevalley.com/uploads/1/3/0/7/130738722/nopofed.pdf
    • http://files.mrspeed.co.uk/uploads/1/3/2/7/132740515/fizoraju-wisajo.pdf
    • http://files.winningtouchequineservices.com/uploads/1/3/2/3/132302749/zomobubibej-pixatetetuxi-xomamib.pdf
    • https://cdn.shopify.com/s/files/1/0431/6751/4788/files/zovejogomom.pdf
    • https://cdn.shopify.com/s/files/1/0433/1703/5166/files/fumolajipuwus.pdf
    • https://cdn.shopify.com/s/files/1/0437/2057/3082/files/blood_red_skies_expanded_rules.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/nomenclature_of_cycloalkenes.pdf
    • https://cdn.shopify.com/s/files/1/0436/4815/5806/files/76272082492.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/48855840958.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/32919950973.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/83914917715.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/tubozegekunewubun.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/20971745112.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/arabian_nights_bangla_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086b4.bin
bed61108e84682b5e49838f7b230e44e7e2a96df391b4a36debb09a372522a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B4 1708 bytes
font_01_sfnt_off00008f28.bin
df545681e955788a83416323c9da5defbbe889d2db24ebd6ed0c5ee25a514b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F28 5348 bytes
font_02_sfnt_off0000a14e.bin
f47c5ec189f0c3c0016236163d3f940b7f3dc2d65c415d95bf26367d8d9f0c8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA14E 11092 bytes

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