Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6f038be9fb8e5a…

MALICIOUS

PDF

57.2 KB Created: 2020-08-05 23:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca337788b70a7edb3dbe0708b4b68134 SHA-1: f648a18212d218934713fd579711c16ee444e4a2 SHA-256: 1a6f038be9fb8e5a4ac93cb63a98574763e1e0527e93ee71497a35157599e8b2
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with a significant number of embedded URLs pointing to external resources. One critical heuristic identified a link to known malicious redirector infrastructure (https://ttraff.cc/pify?keyword=campo+santo+sebald+pdf), indicating a malicious intent to redirect users. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of external links suggests a drive-by download or phishing attempt.

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=campo+santo+sebald+pdf
    • http://files.thevolumeofthebookministries.com/uploads/1/3/1/8/131856700/nonexolofov.pdf
    • http://files.marchesewrestling.com/uploads/1/3/1/3/131379296/gipafitede-pepetesesar-sewokowubeb-pefanax.pdf
    • http://files.nprycetest.com/uploads/1/3/2/6/132695244/f988a6.pdf
    • https://cdn.shopify.com/s/files/1/0434/5049/9222/files/79819227261.pdf
    • https://cdn.shopify.com/s/files/1/0438/3680/1184/files/punepugajetatiguj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/50230736662.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/jibenobuxome.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/novixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/68618659634.pdf
    • https://cdn.shopify.com/s/files/1/0431/8730/6658/files/fishing_lure_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9323/files/spring_batch_tutorial_the_ultimate_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/23649915953.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/magigas.pdf
    • https://cdn.shopify.com/s/files/1/0429/4672/3996/files/54690526014.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_off00009497.bin
1112818169e714c8cb5d881c76b4c41a1edd5b92c6d7ca79e37d104d5d1b3845		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9497 4992 bytes
font_01_sfnt_off0000a579.bin
5261a1c38186a22721375f11c6e8e8dba535f69ecf50432cececc727f3ac5f7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA579 11312 bytes
font_02_sfnt_off0000ca11.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 4324 bytes

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