Malicious PDF — malware analysis report

Static analysis result for SHA-256 299c7b41fc0b29b0…

MALICIOUS

PDF

33.9 KB Created: 2020-08-31 08:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b20638cee741ebe9996545cde5136ec SHA-1: b0b503632baad3bae1b67794190a82c9ee367eb9 SHA-256: 299c7b41fc0b29b0426c1433a7e14a67b1e1843538d6662fe91e58c9df47791f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other benign-looking PDF links, likely part of a link farm, further supports a malicious intent to redirect users. The ML classifier also 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.com/wix?keyword=replication+transcription+and+translation+thinking+questions
    • https://static.usrfiles.com/ugd/8a419d_793166ea66454913a0f69f2fe89317be.pdf
    • https://static.usrfiles.com/ugd/b7ed05_6dd6935bd6fc4ff6bd0b19cd177da84b.pdf
    • https://static.usrfiles.com/ugd/b8c837_28e3e3daad48408fa536b1a636621400.pdf
    • https://cdn.shopify.com/s/files/1/0445/5625/5396/files/70824999507.pdf
    • https://cdn.shopify.com/s/files/1/0434/1347/1384/files/51213348410.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/wisoguwidakifolanarij.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/nidemo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/synonyms_and_antonyms_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0434/0432/9125/files/bootstrap_template_builder.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2730/files/69133529618.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tivaluzisezulumavolo.pdf
    • https://static.usrfiles.com/ugd/625844_7395b738aa764fd0b974ccce31c46283.pdf
    • https://static.usrfiles.com/ugd/314c35_da1bf7c71b5a4365b4144240696edc3a.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_off00004745.bin
c68df5ac8490aac76b57bc882e40c0d123bcbcef3bada7b9aa875ffd9571f4f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x4745 5532 bytes
font_01_sfnt_off000059f8.bin
507e86be8b9f74b4f78f17968d1e664200aa37e7bf61b6048d982b6ee08b983e
pdf-font-stream PDF embedded font (sfnt) at offset 0x59F8 9496 bytes