Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d4da780ef139f1…

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 10:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3726d92d39fb6421042a8c27ef69f272 SHA-1: 92a4889f339704d836a14a65cff7be7c370f6ccd SHA-256: 98d4da780ef139f17351794a8d7cc2d3100a44a623701b7b258c65895d9bad67
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, 'https://ttraff.cc/wix?keyword=bytedance+carpeta+de+androide', is identified as a malicious redirector. This suggests the document is part of a link farm designed to lure users to malicious sites, potentially for phishing or malware distribution.

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/wix?keyword=bytedance+carpeta+de+androide
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/calendario_spal_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0432/6345/9486/files/41807870113.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5671/files/xeralevoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/pilafozumokosulutiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6502/4416/files/basic_accounting_income_statement_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4702/files/aterosklerosis_jurnal.pdf
    • https://cdn.shopify.com/s/files/1/0437/1962/2808/files/indesign_flyer_templates_097.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/gugev.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/duwojivisifado.pdf
    • https://static.usrfiles.com/ugd/67f5f7_934b98c63a3f4c5e921f160d96367580.pdf
    • https://static.usrfiles.com/ugd/23e9be_15c37a8ccc1a4c54ab9103613b91ef3c.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/zixatupuribevemajowoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1542/files/xaxediga.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/83684625985.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_off00005dd3.bin
07921f7a3a12766654c42e0d5574807f743a223516b44f5e062974d45044a292
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD3 5008 bytes
font_01_sfnt_off00006eed.bin
54270caf3a6c07e123c5116bf4ee7fe3f01ccc31c7488b7ecbc66aec0da78504
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EED 10100 bytes