Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a02584220adfddd…

MALICIOUS

PDF

33.6 KB Created: 2020-04-03 07:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de67a7503dea4a699e934e8da855cbec SHA-1: 74af5fb8fded6ebe8b64ea4e444a7baaeb714f37 SHA-256: 1a02584220adfddd7c48f064f41d3936e2a96aa175398f1d9bab6690e70a65b8
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique commonly used for SEO link farms or traffic redirection. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the PDF structure suggest a campaign focused on generating traffic or potentially distributing further malicious content through these linked PDFs.

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://gotvapestache.com/uploads/1/3/0/7/130738727/130738727.html#la+crosse+technology+atomic+clock+how+to+set
    • http://newgrowthgardens.com/uploads/1/3/1/3/131383409/26f8bf48f7fcd4.pdf
    • http://carpetcleaningfw.com/uploads/1/3/1/3/131380993/zerikafi_xexada_fovetuzozikib_bubap.pdf
    • http://gametosuccess.com/uploads/1/3/0/4/130483990/6e5e9d8bcde.pdf
    • http://ecosavon.org/uploads/1/3/0/5/130544070/4d5c3ee1.pdf
    • http://thelumpiashack.net/uploads/1/3/0/2/130272649/7282853.pdf
    • http://diamondpta.com/uploads/1/3/0/4/130488331/movakil.pdf
    • http://airpass.cz/uploads/1/3/0/8/130874678/zelabukatuzup_fitatewojo.pdf
    • http://dinata.com/uploads/1/3/0/6/130639563/a53c217559.pdf
    • http://sonosdois.com/uploads/1/3/0/6/130620345/futazadavuvudox_xajubopojatar.pdf
    • http://firstheaven.net/uploads/1/3/1/0/131069738/3342259.pdf
    • http://flyhighatx.com/uploads/1/3/0/6/130621203/xefofepo.pdf
    • http://brookelinneaphotography.com/uploads/1/3/0/7/130740349/fapifen.pdf
    • http://redfernwineclub.com/uploads/1/3/0/6/130620731/1363781.pdf
    • http://peoria31.com/uploads/1/3/0/3/130313391/danedizumonuzedo.pdf
    • http://buffiecarruth.com/uploads/1/3/0/3/130313108/foxojog.pdf
    • http://better-book.com/uploads/1/3/0/6/130620244/a62f2ac66dd.pdf
    • http://ragingshitpile.net/uploads/1/3/0/3/130324440/torowakowefuf.pdf
    • http://nfldraftdays.com/uploads/1/3/1/3/131382166/gufebewuw_botux_xadomokapesumi_wepebuwutenugot.pdf
    • http://lionrinpoche.org/uploads/1/3/1/3/131379277/tumanamuxa-virigigizikit-wufetefupe.pdf
    • http://thenationsinsuranceagency.com/uploads/1/3/0/6/130639603/minema-numarasiwijuwo-kuzusilat-nifajuzoluv.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e3f.bin
1ad8aa95465f95abf1defb6f9091ca07dbd5d8bcea4df19299edee67b2e156ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3F 6604 bytes

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