Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6507e491b61d481…

MALICIOUS

PDF

50.8 KB Created: 2020-05-25 06:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e301f6c5358743f9b78cf0f0077bc0 SHA-1: a3839e28434c014083d9f2f32eb606f18c2166ea SHA-256: a6507e491b61d481fa66687872b5591cb773376e86f93c8a74222f1bf5d2c5dd
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be SEO-optimized and lead to other PDF files. This pattern suggests a link farm or redirection scheme designed to obscure the ultimate malicious destination. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://3m9.undesirable.us/uploads/1/3/0/6/130605306/130605306.html#1st+marine+division+zippo
    • http://1zk.undesirable.us/uploads/1/3/0/5/130547275/9d3692d91ab90.pdf
    • http://autodiscover.abckidstherapy.com/uploads/1/3/1/4/131437375/kumusi.pdf
    • http://centeringspaces.com/uploads/1/3/0/6/130639567/sobemo.pdf
    • http://alisonlawrence.com/uploads/1/3/0/8/130813136/50b535956d6c935.pdf
    • http://michellewellingtonphotography.com/uploads/1/3/1/3/131384547/6239412.pdf
    • http://payperlessforms.com/uploads/1/3/0/5/130550722/mixutidameluk_senojulumu.pdf
    • http://shedlyne-wild.ca/uploads/1/3/0/5/130551671/8005116e5d.pdf
    • http://popup-brooklyn.com/uploads/1/3/0/6/130639143/zebigepupigasasade.pdf
    • http://ryaportland.com/uploads/1/3/0/4/130476976/rebafosoxe.pdf
    • http://womackstriping.com/uploads/1/3/1/6/131606537/jevetubaretagakabag.pdf
    • http://hvnorml.org/uploads/1/3/0/6/130621031/3658688.pdf
    • http://shopglamclaws.com/uploads/1/3/0/4/130435955/ruruwokiduxuz.pdf
    • http://webdisk.threeseedsfarm.com/uploads/1/3/0/5/130588989/jasemebiponukopov.pdf
    • http://freefallup.com/uploads/1/3/0/2/130287419/eeb5c38af823f65.pdf
    • http://mta-sts.mxe.sozohomechurch.com/uploads/1/3/0/8/130814104/209057.pdf
    • http://desireesfineart.com/uploads/1/3/1/4/131453894/potaviganavise.pdf
    • http://bestcitycleaningservices.net/uploads/1/3/1/6/131606491/7990913.pdf
    • http://outtasightstorage.net/uploads/1/3/0/3/130379381/puvisezomori_fefunaw_xezojupaniw_fodaruve.pdf
    • http://neue-literatur-berlin.de/uploads/1/3/0/6/130639607/ed0e2.pdf
    • http://warriorchefsf.com/uploads/1/3/0/2/130273791/manajebo.pdf
    • http://tillyslandscapingspr.com/uploads/1/3/0/5/130543166/e18bacaad.pdf
    • http://acoupleofcampdirectors.com/uploads/1/3/0/9/130969080/67da53.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009af8.bin
d879f73a78facac8996b4aafb8994a20716377a2548f6e8c48bafdf5127fc169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF8 10600 bytes

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