Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a877427dfddf61…

MALICIOUS

PDF

67.1 KB Created: 2020-08-30 04:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 186ac19652bda51b4fe6ca1cc4aadbf9 SHA-1: 3ecf2b61488c0b586f2d60f4cd85e8e06c8089e5 SHA-256: 42a877427dfddf618f2680e265f94b5babaf43987c41deb36931123b0d8a8651
152 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding a significant number of external links. One of these links, https://ttraff.com/wix?keyword=limites+y+continuidad+de+una+funcion+vectorial, is identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains garbled text but also includes the aforementioned URLs, suggesting a lure to external 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.com/wix?keyword=limites+y+continuidad+de+una+funcion+vectorial
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/vw_golf_mk4_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/9662/7618/files/molecular_thermodynamics_mcquarrie_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5010/6018/files/57158645035.pdf
    • https://cdn.shopify.com/s/files/1/0450/0019/6264/files/zofiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/22716121097.pdf
    • https://cdn.shopify.com/s/files/1/0434/9935/6324/files/punejijenabalemufo.pdf
    • https://cdn.shopify.com/s/files/1/0458/1448/1062/files/alan_jackson_discography_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/mopirepadusagonelegot.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/85857818660.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/81807077622.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34292265756.pdf
    • https://cdn.shopify.com/s/files/1/0437/8663/3374/files/woxinurakanekelefunog.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000848d.bin
f2afb7fe1979837e2ea62005c1d0d81845b7791bec40ecab54523a1c70a09547
pdf-font-stream PDF embedded font (sfnt) at offset 0x848D 11076 bytes
font_01_sfnt_off0000a18f.bin
59aaaef0396e70b55aa059707c8d6e4c7d6f569fd46b85cc01d633c59d8c5bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xA18F 5272 bytes
font_02_sfnt_off0000b36f.bin
babbad6a07efe42b29b43de865947374be4f97df9fc0937a374852bafadc4e30
pdf-font-stream PDF embedded font (sfnt) at offset 0xB36F 16360 bytes
font_03_sfnt_off0000e5d4.bin
abc43a3d2ec121cc1d52f815f500bdfacdec0facf8aaecd93478c13e8ccf1126
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 16708 bytes