Malicious PDF — malware analysis report

Static analysis result for SHA-256 a216a03391e68fdd…

MALICIOUS

PDF

37.2 KB Created: 2020-03-30 02:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1368759f07756de012f7b5f8585889a4 SHA-1: b02c2fdffe4f3f5a5b06239b2d450497a6c22975 SHA-256: a216a03391e68fdde3558f7633572c39d02f70379d356e58f245b638cda3d8a9
94 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing a large number of external URLs pointing to other PDF documents. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of linked PDFs, likely for SEO spam or to distribute further malware. The document body contains garbled text and embedded URLs, reinforcing the link farm detection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://adsl-63-204-18-47.benefitplans.org/uploads/1/3/0/9/130969663/130969663.html#gopro+hero+7+silver+guide
    • http://space2dream.com/uploads/1/3/0/6/130605133/lutazigafopape.pdf
    • http://poppintaggz.org/uploads/1/3/1/3/131380343/6015744.pdf
    • http://centralcarolinasazaleasociety.org/uploads/1/3/1/4/131438783/lobupadebixola.pdf
    • http://safutsal.com.au/uploads/1/3/0/5/130590537/3d8f110.pdf
    • http://kcproclean.com/uploads/1/3/0/8/130874366/204914dfce745.pdf
    • http://expertonboarding.com/uploads/1/3/0/6/130639273/334c3cc8a96a65.pdf
    • http://therapiness.com/uploads/1/3/0/6/130620769/bupuvarudivupan.pdf
    • http://lovethylotus.org/uploads/1/3/0/7/130739879/koritemanejegatowu.pdf
    • http://drpenguin.com/uploads/1/3/0/5/130588531/tanekuf-wumosi-zakogifolubur.pdf
    • http://derekleebarton.com/uploads/1/3/0/4/130483573/3952422.pdf
    • http://caseycipollone.com/uploads/1/3/0/7/130775772/3060492.pdf
    • http://hwam.studio/uploads/1/3/0/4/130483973/b1270f5b131.pdf
    • http://annusalminen.fi/uploads/1/3/0/3/130313086/7598926.pdf
    • http://thestandardstandard.com/uploads/1/3/0/2/130270924/abac26b020d0e1.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_off0000559a.bin
6d63bfb7c87f0b6b2650d24d098edb669d66c31d3570807a24667739b32c1538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x559A 7428 bytes
font_01_sfnt_off000072ca.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CA 16036 bytes

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