Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76c09c9eb76d6c8…

MALICIOUS

PDF

40.9 KB Created: 2020-05-14 22:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30b858b116fb761187930874867ade02 SHA-1: e2f7ec2b09fbf3670ccdedb9f0480d8922258b6d SHA-256: d76c09c9eb76d6c891ff6b1573267c7c4af2edeb38725a584b9d5a640e73236f
94 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. The document body contains a URL that appears to be the primary lure, directing users to 'video compress apk no ads'. No scripts were extracted, and the primary malicious activity appears to be the distribution of numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://littlecrabproductions.com/uploads/1/3/0/6/130604981/130604981.html#video+compress+apk+no+ads
    • http://mchenrycountygopac.com/uploads/1/3/0/5/130590366/kilitatetaxakoxados.pdf
    • http://stawellcares.com/uploads/1/3/0/6/130621587/6194209.pdf
    • http://entrepreneurshift.co/uploads/1/3/1/3/131398148/1884728.pdf
    • http://219perch.com/uploads/1/3/0/3/130379298/64eea170d.pdf
    • http://artstudiogirl.com/uploads/1/3/0/5/130543656/c815e03adb.pdf
    • http://urbanbooksandart.com/uploads/1/3/1/0/131070010/kuvopedopem.pdf
    • http://georgiaescaperooms.com/uploads/1/3/0/6/130620620/gajatamuvalijupiji.pdf
    • http://miamibeachboatclean.com/uploads/1/3/0/4/130476050/pazonoxamu.pdf
    • http://mobile-notary-of-california.com/uploads/1/3/0/5/130588806/sigorexubuzarodo.pdf
    • http://afaparents.org/uploads/1/3/0/2/130272909/6348034.pdf
    • http://agdaturningtostone.com/uploads/1/3/0/6/130605324/biwumoropog-tigaxavaruwu-bumoxu.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_off000053da.bin
876f2710ca4ee4c99967ebf2dcde400d7c2801aafe93c40cf90aeabbaea625cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53DA 2552 bytes
font_01_sfnt_off00005eda.bin
d045ae0ec8b8fae45347a8a715a038e05b8378c277ce8284235bd96ae346ecf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDA 10508 bytes
font_02_sfnt_off0000832f.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832F 16092 bytes

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