Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8124580fff4aed3…

MALICIOUS

PDF

51.0 KB Created: 2020-08-06 09:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e311f8ba3c015b3d5b75456ca83fce4c SHA-1: 99aaee90f0ab6d24055753d54423fedf535a6e9b SHA-256: b8124580fff4aed39ef87e0ed260de82cd556fed6b11e60e3ecaa29a9bdeb0ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of external PDF links, suggesting a link farm. The ML classifier strongly supports the malicious verdict. The embedded URL points to a redirector, likely intended to lead the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.ru/wb?keyword=the%20secret%20doctrine%20helena%20petrovna%20blavatsky%20pdf
    • http://files.staceysandiegotherapy.com/uploads/1/3/1/4/131454270/8c0228f3.pdf
    • http://files.familiessharinghope.org/uploads/1/3/1/6/131606666/jufibogotuvumexateb.pdf
    • http://files.fitfamconshy.com/uploads/1/3/1/6/131607404/vavise.pdf
    • http://vudagum.jrforensicscamp.org/uploads/1/3/2/8/132814930/5555823.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/pogivifaxufiwalonon.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6275/files/xugad.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/80308429928.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/sidapowoxibejetajukewu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0427/1524/files/8557992957.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/71719058450.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/62630150331.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/81115893166.pdf
    • https://cdn.shopify.com/s/files/1/0432/2849/6036/files/40870590504.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/gimolifara.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/r_studio_ubuntu.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/
    • https://cdn.shopify.com/s/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000880c.bin
219dbc9f13f7667a61005cf6dca1bb9b80da87537bd2c7813515078df7d0b6cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x880C 5556 bytes
font_01_sfnt_off00009af4.bin
79883415ca8056a16a829646e9f906edd9078852e667eb5a97d693036231ff51
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF4 10408 bytes