Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bcc61f5d481497…

MALICIOUS

PDF

61.7 KB Created: 2020-04-28 08:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3931c097e6ea66355809a44cffe3c649 SHA-1: fd644dce106f11c0b95a5358df33ff22842436d3 SHA-256: 92bcc61f5d48149736c2dc2ad73cb1638b91b88262d36f0b949a54331f9eaf27
94 Risk Score

Malware Insights

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

The PDF document contains a lure related to "Prime time 6th grade math book answers" and embeds numerous external links. The heuristic PDF_SEO_LINK_FARM indicates a link farm, suggesting the primary purpose is to redirect users to a network of potentially malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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://suppy-taiwan.com/uploads/1/3/0/4/130488416/130488416.html#prime+time+6th+grade+math+book+answers
    • http://cidalcyc.com/uploads/1/3/1/3/131380983/f51d09161c24a89.pdf
    • http://unstillwaters.com/uploads/1/3/1/3/131381021/85c089b8eec7.pdf
    • http://ruric-amari.com/uploads/1/3/1/6/131637773/satitu_fegozezezepalu_tatoje.pdf
    • http://uniquewild.xyz/uploads/1/3/0/6/130604050/2cabf9a69f.pdf
    • http://thecandycup.com/uploads/1/3/0/7/130775515/7346622.pdf
    • http://jessicajoy.com/uploads/1/3/0/2/130289333/jizazimo.pdf
    • http://annaanaka.com/uploads/1/3/1/0/131070688/3724786.pdf
    • http://patriciahu.com/uploads/1/3/0/4/130435588/1042262.pdf
    • http://doughballexpress.com/uploads/1/3/1/6/131637691/votonujog.pdf
    • http://electtimlamay.com/uploads/1/3/0/3/130379145/3447630.pdf
    • http://rippriders.org/uploads/1/3/1/4/131437918/f1f65287f1.pdf
    • http://gwlogistica.com/uploads/1/3/1/8/131871480/1741045.pdf
    • http://englandentertained.com/uploads/1/3/0/3/130379319/kevategerero.pdf
    • http://salazarcooklaw.com/uploads/1/3/0/7/130739519/10372.pdf
    • http://powerhousepartnersgroup.com/uploads/1/3/0/4/130477009/xuwapogumabe_matobiral.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a57.bin
94971b3bb2d49586914da200d0fde28b007dfb453bcf9d7b8b39df9fab5c89b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A57 8456 bytes
font_01_sfnt_off0000ba95.bin
1671d4a6506f7deedb25c13781f115618252e1b93a4aad0bce3c1125e559b732		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA95 4388 bytes
font_02_sfnt_off0000c879.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 2652 bytes
font_03_sfnt_off0000d1e2.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 16204 bytes

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