Malicious PDF — malware analysis report

Static analysis result for SHA-256 852dd6b318ee3981…

MALICIOUS

PDF

42.5 KB Created: 2020-08-03 01:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 236fbac29287234713931f43a8f73fd9 SHA-1: 88dc2f66bfcab56e1447fa152b79a97a43a311ea SHA-256: 852dd6b318ee39813f9c4534608b78004d42fcfd85f47c1101a1d713419911d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=helmet+heroes+hacks', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to PDF files hosted on Shopify, suggesting a link farm or redirection attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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.cc/pify?keyword=helmet+heroes+hacks
    • http://files.ellensalazar.com/uploads/1/3/2/8/132814949/2989405.pdf
    • http://files.ayalalandalviera.com/uploads/1/3/1/6/131607093/jidabig-varotafekonix.pdf
    • http://files.mindfulday.org/uploads/1/3/1/4/131453124/1632921.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/46482669416.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofoxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6631/files/88199392367.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/52311182164.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/visual_studio_redistributable.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/venenatis_guide_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/95401108505.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/tusanapatomevopimuwa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/52485229616.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9585/files/pelir.pdf
    • https://cdn.shopify.com/s/files/1/0436/5733/0853/files/83891757620.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006963.bin
4ad4b78e649810234fd553a3c7aaea32febdcea84c73c1911821aef86a250b7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6963 5064 bytes
font_01_sfnt_off00007a64.bin
a441dca230eef2574f85c7c360980c45beca36610386cc16afbc9e6ca3f02df7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A64 10216 bytes