Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c016610dcd2402…

MALICIOUS

PDF

42.7 KB Created: 2020-08-11 00:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ba1623ded08e011270ca4e677e91186 SHA-1: 48bfda991cffdbd64d09c31385a856a79186b5de SHA-256: 04c016610dcd2402e3b0be715236f7b7d66ad4dd1ae37519166a0f74f318edef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/pify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the embedded links are the primary vector for 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.cc/pify?keyword=contra+la+pareja+agustin+garcia+calvo+pdf
    • http://kugexado.unleashedministry.net/uploads/1/3/0/7/130740510/7609078.pdf
    • http://nolod.reneebolinger.com/uploads/1/3/1/4/131437462/fumajulabosip_wuboti_senumul.pdf
    • http://xubewi.nyabuoy.com/uploads/1/3/1/6/131606349/zibifofi_sejodosix_bariza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0279/6964/files/abstract_reasoning_test_epso.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/salodekejopofepegapokul.pdf
    • https://cdn.shopify.com/s/files/1/0432/1162/0509/files/tewuzudez.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/ruletarelu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1773/8152/files/67614482458.pdf
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/vapiwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikujolam.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/76268468163.pdf
    • https://cdn.shopify.com/s/files/1/0431/6879/2733/files/simedotobuluripawagorune.pdf
    • https://cdn.shopify.com/s/files/1/0434/8326/7236/files/57891504558.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/81582037216.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/vipilalizunuvonilikalusu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006555.bin
8807f15a65a4c9fe54a739ae2da1283651395ae0f747a9a2041a3ef1ca722cb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6555 5364 bytes
font_01_sfnt_off000077af.bin
f9b56613565f02589126759b1da712d50e181c9e4f4d14ad269ebbf89d50cf69
pdf-font-stream PDF embedded font (sfnt) at offset 0x77AF 11080 bytes