Malicious PDF — malware analysis report

Static analysis result for SHA-256 09742d39c7f661ba…

MALICIOUS

PDF

39.3 KB Created: 2020-09-01 00:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d22c2b882fa922d40a2afd8fa89a399a SHA-1: 482beb95cfd2bdfd6f35bfa9d1a1907648923687 SHA-256: 09742d39c7f661ba673191b57df265b2c823bb22a5be19fd28eeef0b549732cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, https://ttraff.ru/wix?keyword=barcelona+training+today, which is likely intended to lead the user to a malicious site. The document also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness.

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/wix?keyword=barcelona+training+today
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/e745be_f6dc56f34d294a11beafd2d23b49a4af.pdf
    • https://static.usrfiles.com/ugd/1be480_c4ceccd96ae44f86b16e505a7960071e.pdf
    • https://static.usrfiles.com/ugd/50c35f_aefbe8eec0a2406482740c4d4f0c74d8.pdf
    • https://static.usrfiles.com/ugd/930050_8a074a9aca134798b4a55faf5116e851.pdf
    • https://cdn.shopify.com/s/files/1/0439/8078/3774/files/call_of_duty_waw_zombies_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/6891/5863/files/17192490972.pdf
    • https://static.usrfiles.com/ugd/b8c837_11284874b64c4b7fb20ec187282ca080.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c1f3fb7df974c00b7f3a8f0f9b5b514.pdf
    • https://static.usrfiles.com/ugd/a4d998_03408f2be438472e8783c0eaf6bb43e4.pdf
    • https://cdn.shopify.com/s/files/1/0438/3562/1526/files/23114734974.pdf
    • https://cdn.shopify.com/s/files/1/0463/5364/5734/files/business_model_generation_a_handbook.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fec.bin
812127228018db750db883cecbdf623e943b546b9a79f352b512d79bd4338d29
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FEC 4868 bytes
font_01_sfnt_off0000607a.bin
a65ce1bc9ac95a68883ac8f3083e86e0c85997fca0f5105c906f08823860d6d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x607A 9996 bytes
font_02_sfnt_off000082b8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x82B8 4324 bytes