Malicious PDF — malware analysis report

Static analysis result for SHA-256 70af9661a6639377…

MALICIOUS

PDF

45.2 KB Created: 2020-05-22 00:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f23f8624af815cb6bf8d83c1e1c0abc SHA-1: 3e6ffacdcb5d6caf5852d1b02ea8414bb3b6f932 SHA-256: 70af9661a6639377d172fd340f0a532582d5ba067e4339aeab9dc536a46ba1c6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs suggests a malicious intent to redirect users. No scripts were extracted, but the PDF structure itself is used to host and link to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://z6.undesirable.us/uploads/1/3/1/8/131856166/131856166.html#pokemon+ranch+wii+wad
    • http://libagric.com/uploads/1/3/1/3/131379206/4829603.pdf
    • http://modernperspectivesnc.com/uploads/1/3/1/4/131437210/cab2bd75dc.pdf
    • http://northtosouthskating.com/uploads/1/3/0/2/130272095/c3ed5d.pdf
    • http://gwe-design.com/uploads/1/3/0/4/130483772/6dde48671d785.pdf
    • http://kriscloketeaching.com/uploads/1/3/0/8/130874369/8073583.pdf
    • http://portmoodyacupuncture.com/uploads/1/3/0/6/130639662/vemoxolakin_jamaliregonofim_mevobe_muliduma.pdf
    • http://thebarracksatm.com/uploads/1/3/0/5/130589427/8574678.pdf
    • http://quaker-transport.net/uploads/1/3/0/4/130493248/67a779.pdf
    • http://chadshoopman.org/uploads/1/3/0/7/130775143/ranavir_zotufosugid_dadulu.pdf
    • http://arrowheadiron.com/uploads/1/3/0/3/130324419/bf2cfcf60ca.pdf
    • http://lionmtn.com/uploads/1/3/0/6/130640136/debixeviwap.pdf
    • http://lrmsnews.com/uploads/1/3/1/3/131384600/9b41f6b0ce.pdf
    • http://boardads.org/uploads/1/3/1/4/131438788/jobasopo.pdf
    • http://groomgeek.com/uploads/1/3/0/7/130775647/f438aae95c771.pdf
    • http://phousingsolutions.com/uploads/1/3/0/4/130488332/rirabipukab-mexomuxeboxadim.pdf
    • http://frenchquartershoes.com/uploads/1/3/0/6/130620620/berujawofow.pdf
    • http://villaforsaleandalucia.com/uploads/1/3/0/6/130639782/4c3a2a1.pdf
    • http://_mta-sts.halowenamioty.pl/uploads/1/3/1/4/131412426/muwedi.pdf
    • http://boziclawoffice.com/uploads/1/3/0/6/130604108/5412918.pdf
    • http://lmetoys.com/uploads/1/3/0/8/130874320/c24d2e78ab.pdf
    • http://egcorseguros.com/uploads/1/3/0/4/130489168/pododikiz.pdf
    • http://haseloff.family/uploads/1/3/0/7/130739177/xadivokojuxemedebum.pdf
    • http://byhisgrace.org/uploads/1/3/1/1/131163977/riwulula_rasokom.pdf
    • http://danaeshell.com/uploads/1/3/0/8/130873843/40f08.pdf
    • http://1st-realty.com/uploads/1/3/0/2/130289421/wizidu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000751f.bin
889640d218f07f3bf887c07e3eeebf61b8fe3a6249d7d935b88e736b0265612b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751F 3908 bytes
font_01_sfnt_off00008303.bin
f6dc9aaa4808eb381c245a0e134c24ba749e2bebd040a91380527b4f694e8e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8303 11080 bytes

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