Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9c041313c3a9d1…

MALICIOUS

PDF

46.8 KB Created: 2020-03-14 19:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fafb3d17c1ab2aae9aa32fd6ca5a7b3b SHA-1: d49d1536413e94f35e50faf385194e158da7fc56 SHA-256: 8f9c041313c3a9d163e80e053b90ecdbb5c437d64ae973ac2b588b2a23adf4be
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be dynamically generated for SEO purposes. The primary heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or distribution network. The embedded URLs and the ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or distribute further payloads.

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://yinghuangguojiyulecheng.br3h.com/uploads/1/3/0/6/130620991/130620991.html#english+dictionary+with+pronunciation+offline+free
    • http://sweetdreamsmarin.com/uploads/1/3/0/7/130740055/pukepowerupagem.pdf
    • http://donketterling.com/uploads/1/3/0/3/130323362/lujufilelu.pdf
    • http://nlwatercolor.net/uploads/1/3/0/3/130379160/zilixugobexa-vogilarezebas.pdf
    • http://stingwrayuk.com/uploads/1/3/0/7/130739510/74c81059441f64.pdf
    • http://centerforculturalfitness.org/uploads/1/3/0/7/130740191/vevedeluziroke.pdf
    • http://veteransvillages.com/uploads/1/3/0/8/130873807/bifol.pdf
    • http://www.fcaky.com/uploads/1/3/0/5/130588185/regedise.pdf
    • http://lucasconstruction.business/uploads/1/3/0/4/130488834/9548474.pdf
    • http://ryan-armstrong.com/uploads/1/3/0/5/130590177/8718519.pdf
    • http://yumabeds.com/uploads/1/3/0/4/130489253/57fc069151.pdf
    • http://www.skarft.com/uploads/1/3/0/5/130588880/lakuzularilalise.pdf
    • http://michaelronaldblake.com/uploads/1/3/0/6/130621206/sorusulute.pdf
    • http://sweetpeaplanners.com/uploads/1/3/0/8/130813420/koxanulagare.pdf
    • http://www.sarahspencestylist.com/uploads/1/3/0/6/130604771/511e63f58.pdf
    • http://cpanel.bellyacresrvpark.com/uploads/1/3/0/4/130478831/todariguxatopuk_guroguduxotosex_pesoramo_nofamazipipipun.pdf
    • http://ik-max.com/uploads/1/3/0/2/130288639/3820350.pdf
    • http://weddingambition.com/uploads/1/3/0/2/130287238/serosixutos_zewovofurofoku.pdf
    • http://aliveand.shop/uploads/1/3/0/5/130588214/c370c.pdf
    • http://room212productions.com/uploads/1/3/0/4/130483299/mipisitakatarav_nokedur_ruwolosa_gusenesu.pdf
    • http://desatascosmaresme.com/uploads/1/3/0/7/130740496/xobepapegebefezidid.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_off00008bc7.bin
5f5cdca460f1d3dc066dea3077f808a9b7720252ebab72a032aeca8eb751c8b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC7 8328 bytes