Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2549ccc08eb12a7…

MALICIOUS

PDF

100.9 KB Created: 2020-08-28 02:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fdd622d2976bd79dbc4886954ab9734 SHA-1: 6d35f6b30b838e8ae293ed98cd8900a7816c39b4 SHA-256: a2549ccc08eb12a7cc17aef49da5e02942ee87be1b80eccd2b562a6c8c69defd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 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.ru/pify?keyword=thalia+life+story', is identified as a known malicious redirector. This suggests a link-farming or redirection-based attack designed to lead users to malicious content. The ML classifier also flagged this PDF with high confidence.

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/pify?keyword=thalia+life+story
    • http://files.everythinghockey.org/uploads/1/3/0/9/130968984/towekevo_nuwobovufa_noxelula.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/20290787707.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/tesutukitatiwekujolab.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/6438919173.pdf
    • https://cdn.shopify.com/s/files/1/0436/5955/9065/files/67118273234.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/petrovietnam_fertilizer_and_chemicals_corporation_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/3803/8426/files/lulifaregorewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/publication_manual_of_apa_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/4714/7925/files/ableton_live_manual_9.pdf
    • https://cdn.shopify.com/s/files/1/0434/4601/0022/files/87415386386.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5316/files/woweluwitasoligekazunuge.pdf
    • https://cdn.shopify.com/s/files/1/0457/6080/7068/files/envelope_template_google_docs.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_off00014c6f.bin
74745c205aaf47a4b226aad9e5596a18ca59d541b9efd3aaac0e2d2a752d9803
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6F 4904 bytes
font_01_sfnt_off00015d1a.bin
cefb3712caa1b4a55e0a6cecb04cd456638b46d6e8a7aa3b41550c0ce869771e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1A 12504 bytes