Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c886246b0f2f841…

MALICIOUS

PDF

33.5 KB Created: 2020-08-11 17:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb3d0ffa68ef052c8194418da2a0b3b3 SHA-1: d0761bfefbb0a69b4c5cb362ba2fb937dd6b6445 SHA-256: 8c886246b0f2f84108934bc6b4beac3e2626655259bff85e0df10347f51e0da4
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector at `https://ttraff.ru/wb?keyword=genius%20xr3%20manual`. This indicates a link farm or phishing attempt disguised as a product manual. The ML classifier strongly supports the malicious verdict.

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=genius%20xr3%20manual
    • http://files.pioneerframeworks.com/uploads/1/3/1/8/131856435/940ce06a49368f.pdf
    • http://gofen.dianamariarossiart.com/uploads/1/3/2/6/132681352/viguvokuruka.pdf
    • http://files.stickystripz.com/uploads/1/3/2/8/132814146/kivisizifumewo.pdf
    • http://files.jossavate.com/uploads/1/3/0/8/130874359/toruzolutetefexowaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8316/files/gelireninumax.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/farebuv.pdf
    • https://cdn.shopify.com/s/files/1/0439/4365/7627/files/genewokugazofojedij.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/five_characteristics_of_educational_research.pdf
    • https://cdn.shopify.com/s/files/1/0433/4046/4281/files/84641892080.pdf
    • https://cdn.shopify.com/s/files/1/0441/0304/1176/files/game_of_thrones_risk_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/62921796284.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0839/files/kexegu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/40386252182.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/fusij.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_off0000460d.bin
e7e4ba74702e9ff30059ccaa5a1b214e1a5283c463ba7c1bfeb08d3a06d8cd51
pdf-font-stream PDF embedded font (sfnt) at offset 0x460D 5092 bytes
font_01_sfnt_off0000574d.bin
4a1b8b187b8ed16541b0002cc9dccd8b19c824bdbc6ecf7b664ada1e33b8e5e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x574D 10364 bytes