Malicious PDF — malware analysis report

Static analysis result for SHA-256 337c946d972a7284…

MALICIOUS

PDF

31.7 KB Created: 2020-04-07 19:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d586d6561ca863434eac83198ac10aad SHA-1: e93d52573f3d3e1d84e8063d6d16243211f15dff SHA-256: 337c946d972a728477766b62c30ecaf696d69ec57e04755577b79e8cdeea13d0
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files with numeric slugs, characteristic of a link farm designed for SEO manipulation. The ML classifier strongly indicated maliciousness. The embedded document body text, though heavily obfuscated, contains a URL that appears to be the primary lure, directing users to a specific HTML page. The primary purpose appears to be driving traffic to a network of potentially malicious or spam-related websites.

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://smilehearthk.com/uploads/1/3/0/6/130604768/130604768.html#best+part+lyrics+her
    • http://westpennradiatorcovers.com/uploads/1/3/1/0/131070131/5e3c9b543.pdf
    • http://iamsrvnt.org/uploads/1/3/0/2/130270989/tazizadinemugid.pdf
    • http://scaragesale.com/uploads/1/3/0/6/130605521/gijirawomalisetulox.pdf
    • http://zuullabs.com/uploads/1/3/0/7/130775142/timebesu-serewobakifu-ketozuxos-meruburekowu.pdf
    • http://kabase.ca/uploads/1/3/1/0/131070306/f247b8.pdf
    • http://thespamtool.com/uploads/1/3/0/6/130639976/c7c7165161248.pdf
    • http://clarelillig.com/uploads/1/3/1/0/131070652/jatunegozuruv-perukur-ruxolatekiremud.pdf
    • http://whatsmyiragonnado.com/uploads/1/3/0/7/130740617/12c98.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_off00005566.bin
8bd65c7d0bded852a377490992d82d6a38f55c58023569da055a298d1a5286f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5566 7432 bytes

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