Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae99158514d19bc…

MALICIOUS

PDF

90.8 KB Created: 2020-05-24 02:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9a6d82c97da489007a7eb2db02496e7 SHA-1: e5597bd38aa81ea8d7595f7a78405962dc43eeb7 SHA-256: 3ae99158514d19bc6d3a03709a20376b8165384f4dc9c653bd1cf0c460e4b131
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. This suggests the document's primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://goldclub.lucky1st.com/uploads/1/3/0/5/130543980/130543980.html#ars+magica+2+guide
    • http://webmail.portclintonattorney.com/uploads/1/3/0/6/130605504/fufuju.pdf
    • http://roadracewarrior.com/uploads/1/3/1/1/131164448/53758dcdcb07.pdf
    • http://dogforsalehouston.com/uploads/1/3/0/4/130435966/nukejunoda_wefuwef.pdf
    • http://senderdeals.com/uploads/1/3/0/6/130603905/9921603.pdf
    • http://callforhelp.us/uploads/1/3/0/2/130291453/c1e0a.pdf
    • http://thevictoriafreehouse.com/uploads/1/3/0/4/130483276/towabiberidebe.pdf
    • http://shamanmods.com/uploads/1/3/0/7/130740502/wawomomowovo.pdf
    • http://webdisk.uncagedventures.com/uploads/1/3/0/6/130603874/31a2cec43b5cf9.pdf
    • http://swiftshiftcranes.com/uploads/1/3/0/6/130603828/dedoreso.pdf
    • http://hippiecafestore.com/uploads/1/3/0/4/130483633/pupaxokijejo-pekotiwad-xinogani.pdf
    • http://victoriaeyes.com/uploads/1/3/0/3/130313021/1649534.pdf
    • http://justinroy.com/uploads/1/3/0/7/130775337/4ea8a.pdf
    • http://gbsteelworksandengineeringltd.com/uploads/1/3/0/5/130544591/tifokaz_busoveti.pdf
    • http://mikaren.com/uploads/1/3/1/4/131438500/3119492.pdf
    • http://beanersandwiens.com/uploads/1/3/0/8/130874090/puzomafumuxuxi-ridituvarasarop-xenodarulitopup-lufat.pdf
    • http://halowenamioty.pl/uploads/1/3/0/2/130287318/a80982146.pdf
    • http://cmc-motorsport.com/uploads/1/3/0/7/130776169/2804422.pdf
    • http://mariedowyn.com/uploads/1/3/1/6/131607169/zokazafel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009538.bin
1e94c1aef3c21ee09f8c1d2089b614f944cc5795d60f6aa93b5e258e7610a0f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9538 55948 bytes
font_01_sfnt_off0001283b.bin
ab3ba0b83d1364dd7fe98b8f33d8c2590453d6f08276930d41e9b8d8477d358a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 9300 bytes
font_02_sfnt_off00014847.bin
f7fb55aa7df24da556f1e6a14ff3e973b5c7274e6851c040e899454d18355684
pdf-font-stream PDF embedded font (sfnt) at offset 0x14847 16064 bytes