Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e5276c6bb1ce11…

MALICIOUS

PDF

41.3 KB Created: 2020-09-02 16:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb14504aca77bc23cbed94ffbe616901 SHA-1: da8f4e576c48a428fff06d7a802646f7741fb5f0 SHA-256: b4e5276c6bb1ce11a7ef3a5a692f94d9c26f1ae1d33518bfb2254c18ffe61841
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=game+bouncy+ball+mod+apk'. The document body, though heavily obfuscated, contains keywords related to this URL, suggesting a lure. The PDF also hosts a large number of links to Shopify domains, likely part of a link farm to improve SEO for malicious content.

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=game+bouncy+ball+mod+apk
    • https://cdn.shopify.com/s/files/1/0438/0151/0045/files/mexinekemoworozogewuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/fodolobetejugivarot.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7814/files/71072347111.pdf
    • https://cdn.shopify.com/s/files/1/0457/5638/3396/files/captive_portal_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/guider_synonyme_mots_flchs.pdf
    • https://cdn.shopify.com/s/files/1/0436/5628/2265/files/57324855167.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/us_states_list_text.pdf
    • https://cdn.shopify.com/s/files/1/0434/4460/0999/files/fluid_mechanics_7th_edition_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/fujidopen.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7177/files/degiwabulepogunenogorub.pdf
    • https://static.usrfiles.com/ugd/f241d9_42516b8c0b6c4fd495925ec1848a48c8.pdf
    • https://static.usrfiles.com/ugd/b42fd6_95383178aaff4eeda73904c50cf983ee.pdf
    • https://static.usrfiles.com/ugd/45fd81_ed49d8adcd6c4576a064a19850e55096.pdf
    • https://static.usrfiles.com/ugd/ccf397_294bcf6bc48b4bb38be0669ef9c8d2ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f434805ddda4e75bd6a79c4399aa167.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_off000061c1.bin
1ab10cdd13a133b1f450ac7503e228fdc418c4dc0168d1cb276fc43126300976
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C1 5280 bytes
font_01_sfnt_off000073b2.bin
785c7e5e3b4302284972159ba4d9e3bb4b98a0e28d32457b9612ba7a36daea6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 10792 bytes