Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1f3c2b49714923…

MALICIOUS

PDF

39.4 KB Created: 2020-03-20 01:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e72550b4d482ba15553dd5847c97822d SHA-1: ba501813647c258d599015a09223dc60e97f62da SHA-256: 4b1f3c2b497149236bb956626a4ae23209415a54e6205c04569eda34ebb080f6
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous external links, many with numeric or generic slugs, suggesting a link farm or SEO spam tactic. The primary URL points to a page with 'ualbany student health center' in its fragment, potentially a lure. No scripts were extracted, but the sheer volume of external links and the ML score confirm a malicious intent to redirect users.

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://qingmang.coffee/uploads/1/3/0/4/130483202/130483202.html#ualbany+student+health+center
    • http://www.edinburghtrumpet.co.uk/uploads/1/3/0/4/130476144/aca809e6a.pdf
    • http://nooracademyonline.com/uploads/1/3/0/6/130620847/dupus_filokadebide_dajajor.pdf
    • http://www.facotourscr.com/uploads/1/3/0/7/130775970/poxogi.pdf
    • http://chokola.com/uploads/1/3/0/2/130289632/gagatin.pdf
    • http://www.erikschutte.com/uploads/1/3/0/5/130588983/9029329.pdf
    • http://www.christhebosskennedy.com/uploads/1/3/0/4/130477775/moravofiwewa-virelifod-dujafexupep-javunejopetukin.pdf
    • http://www.sflfiservsafeclasses.com/uploads/1/3/0/2/130272328/ruzofisubixigeki.pdf
    • http://cynthiapetersen.com/uploads/1/3/0/8/130873846/baliberutoxir.pdf
    • http://trivettefamilyfarm.com/uploads/1/3/0/3/130313612/tasejalanufuteti.pdf
    • http://dontforgetyourluggage.com/uploads/1/3/0/6/130620926/1399945.pdf
    • http://oddmachinestudios.com/uploads/1/3/0/6/130605312/01cac8.pdf
    • http://www.ndlchauffeurs.co.uk/uploads/1/3/0/5/130551210/a4c335e.pdf
    • http://musicoterapias.com/uploads/1/3/0/6/130621330/sumanosuwojuxu_pinesin_nokipadimef.pdf
    • http://www.igy6veteran.com/uploads/1/3/0/5/130589010/509058.pdf
    • http://bnaaok.com/uploads/1/3/0/4/130483811/lesokobije.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_off00006ec7.bin
3eab66ce4c4b3e1293092b7384a1d441d4668b977ef355c99f97cd978ab02744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC7 9028 bytes

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