Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aa5f3a9faaee06…

MALICIOUS

PDF

35.1 KB Created: 2020-08-29 18:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e98a82172edf26207c6f401cf170f5d5 SHA-1: d8242e02c79d0d03edd56cd8b2eb6875c5d8fcb2 SHA-256: a3aa5f3a9faaee0619f9d141cb7aaeeb7a93bbc08dad47c3d19a3ca8047a8232
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. The link points to ttraff.com, a known malicious domain. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links to external PDFs, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicates 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.com/wix?keyword=fallout+4+vault+88+guide
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/refog.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/sutatolufajaxexapemudop.pdf
    • https://cdn.shopify.com/s/files/1/0430/7599/3764/files/54105768124.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/44578439023.pdf
    • https://static.usrfiles.com/ugd/b8c837_b774de486801435798db6261650220c7.pdf
    • https://static.usrfiles.com/ugd/9219f8_c0808fe4f4b44d3080a4caf3a256f923.pdf
    • https://static.usrfiles.com/ugd/b8c837_25ba539ba84e406a9d6b52004b1e64aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_c932625d6e78453ca8ecbc84a2ade8ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e8e1677c4d24c3b96da265f62ba50d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_719c5dcdcfe849dfae97a78cf33d54d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d875483a2744488dac7ae11cefa3fc74.pdf
    • https://static.usrfiles.com/ugd/b8c837_605c73bb4fdf4a62acfc805c535965d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_282144d27d114da48b8ec9f09c875d99.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6723/files/pawibebab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9872/5793/files/masiw.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_off00004c63.bin
ffa710e6d9bc2fb8cf7f861684b4a58f69aeccd3235c3ba805643571a3b06a23
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C63 5016 bytes
font_01_sfnt_off00005d93.bin
655ed581a7342b498ff93a70448bf07abf19f5d3c585fd55fb2d0dd164d68748
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D93 10284 bytes