Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbab6346bb8b63a…

MALICIOUS

PDF

36.8 KB Created: 2020-08-02 03:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4475ae3c2f0ac4866612f5f85d07569 SHA-1: bef8d18f9c316519e41c4e0a09e30467bc0407ba SHA-256: 9cbab6346bb8b63a5fa26cd9e0ec3d117de3598a37442732d1171bd07cb0b0dd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, forming a link farm. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely the primary malicious payload delivery mechanism. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of the link farm and the malicious redirector indicates a social engineering attack aimed at redirecting the user to 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.cc/pify?keyword=foxfi+full+apk
    • http://files.kobanuniverse.net/uploads/1/3/2/7/132710624/b3c2d2598da5.pdf
    • http://files.debbiepowersauthor.com/uploads/1/3/1/4/131437446/535a815243f.pdf
    • http://files.moanxiety.com/uploads/1/3/1/8/131857465/001aa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/bipisinebuburiroxopogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5489/files/zugokimewi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3445/0840/files/dosasunumemefejakexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8059/files/vedotexipafegarowoxonez.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/xigurujomomasatugibapu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/dulalovafo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/ferixexuminusapuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/6222/3263/files/8436385163.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/97833759919.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/fawoluruliromulezila.pdf
    • https://cdn.shopify.com/s/files/1/0438/9643/8936/files/31095264588.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/nujixigobikal.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_off00005515.bin
3417a9c7c1ac95b43e1033198df8c604b2340b1ae1fad5ccd0eefd88b98daa98
pdf-font-stream PDF embedded font (sfnt) at offset 0x5515 4708 bytes
font_01_sfnt_off0000653d.bin
66f6c2de328751d832e995248828d7b9ae5a8669278f28d23b0c7e3b71aa65b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x653D 9856 bytes