Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbfecf55acadf24…

MALICIOUS

PDF

43.4 KB Created: 2020-08-11 23:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc165bb02b83e43d68e97d51ffcd4deb SHA-1: 17d3c514c19e4fed59de65782e4f8cdc8cb91b9b SHA-256: dcbfecf55acadf249e0ba6c3bd8801bdf8b6029817346acf6152a8b5aa666729
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains text related to 'business model generation' and the malicious URL, suggesting a lure. The presence of a link farm heuristic further supports the malicious intent of directing users to external, potentially harmful, content. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a malicious redirection attack.

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=business+model+generation+pdf+drive
    • http://files.mysamcooke.com/uploads/1/3/1/4/131452958/1105536.pdf
    • http://pilef.spiritualteapot.com/uploads/1/3/1/4/131407424/sijididigovob.pdf
    • http://files.knoxwm.com/uploads/1/3/2/7/132712214/6dbdc8904d90.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lewajoranuputefikilos.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/pdf_book_reader_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/meradujedovegevawupajefif.pdf
    • https://cdn.shopify.com/s/files/1/0437/4131/5223/files/segnale_analogico_e_digitale.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/44105885037.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/co2_welding_machine_specification.pdf
    • https://cdn.shopify.com/s/files/1/0434/8195/6518/files/singapore_airlines_company_profile.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/pumovapejotikogojaza.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/nufewiwuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/tatuvaxame.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_off00006bb3.bin
e15a681e5add2ba486699c9f74835d6dd5f82ca0559dd5ae632ed3eb0f299021
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB3 5472 bytes
font_01_sfnt_off00007e40.bin
00a7b2046fe428f721753a4f747cf7227000fa15ba9a05326dffe8e3266ef36b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E40 10104 bytes