Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa94ea7f1bba3a9…

MALICIOUS

PDF

43.2 KB Created: 2020-09-04 15:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1db5b6d37942726affc4ae25ddf51be SHA-1: 005fc933469e592ba89e5601f1f738a8b979f85f SHA-256: 9aa94ea7f1bba3a9396a9f7abead9cd54a1e04379039af53142d8b4f4c14d850
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, forming a link farm. One of these links, 'https://ttraff.link/pify?keyword=abbott+freestyle+libre+2+software', points to known malicious redirector infrastructure. The document body contains garbled text but includes the same malicious URL and several benign-looking URLs hosted on static.usrfiles.com and cdn.shopify.com, suggesting a lure to disguise the malicious redirection. 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.link/pify?keyword=abbott+freestyle+libre+2+software
    • https://static.usrfiles.com/ugd/ed64d2_a9b348a2d20048f29baffb16c6d37044.pdf
    • https://static.usrfiles.com/ugd/3b5dd9_a975f32c561f4507917e64240988e41e.pdf
    • https://static.usrfiles.com/ugd/f64db8_569c3dd16c0b4df284ca7971fd2cd073.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fab0fb2f8284ee8a177317f2dddbf43.pdf
    • https://static.usrfiles.com/ugd/954c8b_4e6fce80fd80452da489458817908ffa.pdf
    • https://static.usrfiles.com/ugd/5438e3_01dc3e986e5449da988aa3a828694407.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/strategic_thinking_and_planning.pdf
    • https://cdn.shopify.com/s/files/1/0435/1832/8991/files/jenesipuguduxekuvoga.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/iron_man_2_full_movie_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/83044897457.pdf
    • https://cdn.shopify.com/s/files/1/0434/2739/7797/files/annexure_for_tatkal_passport.pdf
    • https://cdn.shopify.com/s/files/1/0463/2461/3275/files/pevutikima.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e94.bin
b717aff348be25e5333c0ebebb7f20bb71f65dc718af4dbb349c6ffca07806c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E94 4900 bytes
font_01_sfnt_off00006f60.bin
0704b7809f94d461633a1a2bde5aab31b26446788856850eb5638681cbba1603
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F60 10196 bytes
font_02_sfnt_off00009248.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9248 4324 bytes