Malicious PDF — malware analysis report

Static analysis result for SHA-256 be15a4f8a6672ff5…

MALICIOUS

PDF

39.2 KB Created: 2020-08-02 16:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3faea735fde6c064fff0ac4690cd9af SHA-1: 2422ce634bd692a045be681f5d41a1dad7deef64 SHA-256: be15a4f8a6672ff5777f8a51aa5be411fc809fe04a1ad3f782d2d9830664e7ec
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious indicator is the embedded URL pointing to 'ttraff.cc', which is known for redirecting to malicious content. The document body contains a mix of garbled text and URLs, suggesting it's designed to host a large number of links rather than convey meaningful information.

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=shake+event+rpgmaker+mv
    • http://files.chrislockett.com/uploads/1/3/1/8/131871772/aae4f0375.pdf
    • http://files.comeshootwithme.com/uploads/1/3/0/7/130776200/9736772.pdf
    • http://files.haliburtoncountyfoodnet.com/uploads/1/3/1/4/131453241/93ac4.pdf
    • http://files.tylerosburn.com/uploads/1/3/0/7/130775245/3f6b083d439.pdf
    • http://files.ftscwomensindoorcup.com/uploads/1/3/1/4/131407818/16f7a8.pdf
    • https://cdn.shopify.com/s/files/1/0431/2868/4701/files/25196976798.pdf
    • https://cdn.shopify.com/s/files/1/0428/3265/8588/files/58338053223.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/c_sort_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/romotivu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/57455231977.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/jufukovos.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/larupo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/gokaji.pdf
    • https://cdn.shopify.com/s/files/1/0439/4234/6907/files/79328999709.pdf
    • https://cdn.shopify.com/s/files/1/0432/4353/6552/files/lizaritifeboxabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2501/files/toxefutemifunujatuzumawut.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_off00005c6e.bin
cfbff697f441d2af63ff463dbf4f8a71ffbc65858fde95db21ea38eb81384a23
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6E 5252 bytes
font_01_sfnt_off00006e29.bin
203677fedee770b17d5d516781068a5fd243179037be79db38068cf6a27eb20e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E29 9892 bytes