Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96e37ab2fc82ca7…

MALICIOUS

PDF

45.4 KB Created: 2020-08-31 01:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee13c6037c118493a9e86e3fe9fe71a5 SHA-1: afe6f90a3f0658f912ea3bc0e32aed18bdb1bb06 SHA-256: a96e37ab2fc82ca7deaeb1934de050e6cb2a0942a94b3aa8e1b15ae1d49933a0
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that the document is designed to host numerous links, likely to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of links points to a delivery mechanism for further malicious activity.

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.ru/wix?keyword=aarp+games+deja+vu+solitaire
    • https://static.usrfiles.com/ugd/ca300b_9b29c9653dd9494a92264aa1b9f92402.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ec1d9ee7eac4a38b0657e0d1540be51.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b3d2e4acaca41d0aa66ff906e5fabe5.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/modenonibewefokeloruxini.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/41860908162.pdf
    • https://cdn.shopify.com/s/files/1/0431/8216/2084/files/nujunulo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/wegur.pdf
    • https://cdn.shopify.com/s/files/1/0433/4390/4927/files/sasono.pdf
    • https://cdn.shopify.com/s/files/1/0462/0088/1302/files/kaspersky_antivirus_2018_key.pdf
    • https://static.usrfiles.com/ugd/c1615c_f91667e3401e4de18a1105d2907a9785.pdf
    • https://static.usrfiles.com/ugd/1f2646_a5e1d118eae94389b4f9037f4f08d4ed.pdf
    • https://static.usrfiles.com/ugd/1a89c8_2061d418bb924018b1f03179fc4be690.pdf
    • https://static.usrfiles.com/ugd/01bc73_5d3473bb13eb4fc2a61f02f3b3c6f449.pdf
    • https://static.usrfiles.com/ugd/b8c837_053c0258328d466fb7a69ceb52b4bdd0.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_off000063be.bin
2d141adbb88783d491e6cb5d0481ac2376fcd42e84f7b2e43b034e9e727f6806
pdf-font-stream PDF embedded font (sfnt) at offset 0x63BE 5180 bytes
font_01_sfnt_off00007571.bin
a74c62da38f0a18fe796dd7fabac88d4bde426693c2772bb444aaf6bb877bff4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7571 10888 bytes
font_02_sfnt_off00009aa9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA9 4324 bytes