Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a403dabdb6f5485…

MALICIOUS

PDF

66.0 KB Created: 2020-04-03 12:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 76255d5b7ec8c5457ba3d829a2eb4239 SHA-1: a17454c59ecc893cce091d28928d44d755534deb SHA-256: 6a403dabdb6f548523b1238d71c1c495fc26e9682305fadac3714b9b03f7f2d6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be the creation of a link farm or SEO spam, directing users to numerous PDF files hosted on unrelated domains. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of specific user lures.

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://starrmark.net/uploads/1/3/0/5/130543106/130543106.html#nombre+de+posiciones+balonmano
    • http://mysweetsour.com/uploads/1/3/0/7/130738554/banowasaxaxid.pdf
    • http://baltimorechildanxiety.com/uploads/1/3/0/6/130604392/gexezidixigamopasaj.pdf
    • http://lauschzeichen.de/uploads/1/3/1/3/131397997/bewozigonavalukuxeso.pdf
    • http://certifiedonez.com/uploads/1/3/0/6/130604263/surepisukeg_tejutupiniviver_bixawopezemo_sifabedekefa.pdf
    • http://tianalyticsltd.org/uploads/1/3/0/5/130546543/7262288.pdf
    • http://sparklingbluepool-service.com/uploads/1/3/0/2/130289652/2505161.pdf
    • http://gondaragency.com/uploads/1/3/0/9/130969708/worobirokaremosuken.pdf
    • http://southernoregonwellnessretreat.com/uploads/1/3/1/0/131070204/4a504283766ebe.pdf
    • http://artoflosingmyself.org/uploads/1/3/0/2/130291489/9852448.pdf
    • http://kikieverard.com/uploads/1/3/0/7/130738700/c9ebb7d9c3d6d53.pdf
    • http://truckeephotoroom.com/uploads/1/3/0/5/130588286/8011634.pdf
    • http://rubyit.co/uploads/1/3/0/6/130621464/6375197.pdf
    • http://texasrpremodel.com/uploads/1/3/0/7/130775248/tofunarejupu.pdf
    • http://rifugiovallegrande.shop/uploads/1/3/0/5/130588688/fawokamiju.pdf
    • http://wildflowersistersboutique.com/uploads/1/3/0/6/130639214/pofafisalowujugexe.pdf
    • http://freesiamusicstudio.com/uploads/1/3/0/7/130775634/88c36bcf89.pdf
    • http://texascoastalexchange.net/uploads/1/3/1/0/131071286/3209529.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ee.bin
a799746912aa1303c829717b0c44720049d6a1b810dbafd7238fb5b62905e5c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EE 11080 bytes
font_01_sfnt_off0000d9c0.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 2652 bytes
font_02_sfnt_off0000e327.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 16036 bytes

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