Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb75965bc3bc267…

MALICIOUS

PDF

42.2 KB Created: 2020-06-20 22:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 357db9c57379ada7233aee3586c9ae7f SHA-1: 2fdbd2df8e0297a2f258e0cefe881facb1518170 SHA-256: bcb75965bc3bc267d8742ba55f9fd2fe6770c71c7b57151175753190e959f361
94 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains a significant number of external links, characteristic of a link farm or SEO spam. The document body, though partially obfuscated, contains the text 'Wow arena strategy guides' and numerous URLs, suggesting a lure to entice users to click on these links. The primary purpose appears to be redirecting users to other malicious or spam-related content hosted on various domains.

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://catsincrisisinc.org/uploads/1/3/0/3/130313445/130313445.html#wow+arena+strategy+guides
    • http://stylizedsoul.com/uploads/1/3/0/4/130435787/mekolutisigav.pdf
    • http://pipersnectar.com/uploads/1/3/0/7/130776808/fdddb47.pdf
    • http://nousinfra.com/uploads/1/3/0/5/130539517/merezi_nutos.pdf
    • http://higginsrestoration.com/uploads/1/3/0/7/130739233/4511526.pdf
    • http://thecardr.net/uploads/1/3/0/2/130289277/zemug_ladigofejowakod_mukudularativad.pdf
    • http://kholoudhilal.com/uploads/1/3/0/2/130272963/2550381.pdf
    • http://instpastoralsocialwagha.org/uploads/1/3/0/5/130590507/polokaji.pdf
    • http://nwheactionlearning.org/uploads/1/3/1/4/131406744/kifujigebigikiripa.pdf
    • http://tuxrentalinnashua.com/uploads/1/3/1/3/131379615/1308124.pdf
    • http://asesoresdesegurosmanejar.com/uploads/1/3/1/4/131412858/tosowese-kuwisodejus-salamuvupem.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006699.bin
3ee0af83b02d9ff434b0bb58438b7b8062bc9f0c4ecb62f826f4cf697284a241		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6699 5052 bytes
font_01_sfnt_off000077e7.bin
0379b3a2a7722ca25815b608c4b20af086c3a107088bc6818d34a7d49e0fd6f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E7 10760 bytes

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