Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9fa0524f597061…

MALICIOUS

PDF

54.9 KB Created: 2020-08-23 22:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10dfec4f19487807dd79f267e0c2b0a8 SHA-1: b84e7b7623fffad8e951fc428596e8f97e793c17 SHA-256: ca9fa0524f5970612c42737b08d5f0a41977660d0e2e2f721717d7788e5df53a
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a PDF link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=3d+photo+live+wallpaper'. Another critical heuristic noted a PDF link farm, with many links pointing to Shopify-hosted PDFs. The document body contains garbled text but includes the same redirector URL and several Shopify URLs.

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.com/pify?keyword=3d+photo+live+wallpaper
    • http://fewunipi.jesskamstra.com/uploads/1/3/0/8/130873715/kadiduvatiwu-faxupi-mavibe-tinedagoxak.pdf
    • http://files.vintagenouveauphoto.com/uploads/1/3/1/0/131069978/sezamexe-fuxirisewanakig-melonazime.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3553/files/suitability_acceptability_feasibility.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/57831712470.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/jamarivatokakope.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8661/files/41478915108.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/14316909376.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/83954775533.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/fixivowemefimirux.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/file._z_l_file_g.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5174/files/fundamentals_of_anaerobic_digestion_of_wastewater_sludges.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/13463102619.pdf
    • https://cdn.shopify.com/s/files/1/0433/1667/4713/files/basic_excel_training_material.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/tunet.pdf
    • https://cdn.shopify.com/s/files/1/0440/7053/5318/files/xaxopa.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_off00008d3d.bin
c241594139217ec7eea76e7835e2c75eaecaafbb98d311c10e18db79badb6d2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3D 5092 bytes
font_01_sfnt_off00009e9c.bin
6c3195ff88202897410b7b57c893f41041a47e3661cc799a61a8034a68e383ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E9C 15756 bytes