Malicious PDF — malware analysis report

Static analysis result for SHA-256 948cbbcdef440709…

MALICIOUS

PDF

45.7 KB Created: 2020-04-19 10:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4190c94f007707292c27d5595844399 SHA-1: 8ba34cb001175879dec5f81b945555684319c7a7 SHA-256: 948cbbcdef440709ed57bcd4511a4343f457f5b5c494545b21afc0b46877f69f
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious websites. The document body, though partially corrupted, suggests a lure related to 'free templates'. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The primary IOC is the first external URL found, which appears to be part of this link farm.

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://thehappygirlstore.com/uploads/1/3/0/4/130435794/130435794.html#print+gift+certificates+free+templates
    • http://floridainternationalpageants.com/uploads/1/3/0/5/130588685/906114.pdf
    • http://jwylibrary.com/uploads/1/3/0/5/130589420/xoradi_pikopubavawe_ranaxiz.pdf
    • http://lulitorres.com/uploads/1/3/0/6/130604945/77f82b5d0619a.pdf
    • http://el-equipo.com/uploads/1/3/0/6/130604630/9446360.pdf
    • http://childrensliteratureassembly.com/uploads/1/3/0/9/130969308/492893.pdf
    • http://plussizeweddingdressesma.com/uploads/1/3/1/0/131069897/tusawulow.pdf
    • http://customequestrianproducts.com/uploads/1/3/0/4/130490561/8484832.pdf
    • http://forestbathingnj.com/uploads/1/3/0/5/130550683/406134.pdf
    • http://itcgym.com/uploads/1/3/0/8/130873941/morolup.pdf
    • http://blessingsandblingbylacey.com/uploads/1/3/0/7/130776866/savozemoduj_sewasibeta.pdf
    • http://icandee.org/uploads/1/3/1/3/131380601/1650199.pdf
    • http://kimmiebears.com/uploads/1/3/0/5/130540585/3102e.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_off0000802d.bin
eb13c9c857dbc6c58207537943f4d8d2c132f636a81c3b0a982b4f3b633dd56d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802D 8572 bytes
font_01_sfnt_off0000a11d.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA11D 2616 bytes

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