Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc931e9b284108d…

MALICIOUS

PDF

44.1 KB Created: 2020-11-04 17:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18fec7bc59b28742581ba22d54e1b8dc SHA-1: 15ce85a02126f175054417d5151cfc62f5720a0c SHA-256: fdc931e9b284108d4ae57e95f5de2e73cc0d12ad8e0467ddbcbff656a7b2fd5a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with seemingly innocuous text. The presence of numerous other PDF links suggests a link farm or SEO spamming attempt, likely to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, possibly leveraging embedded JavaScript for redirection.

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.club/123?keyword=transitive+property+of+congruence+rule
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/rimum.pdf
    • https://wagizubim.weebly.com/uploads/1/3/4/4/134470033/6297591.pdf
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/zenudi_muvagubanetive.pdf
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/31cc541155e.pdf
    • https://xaranetudu.weebly.com/uploads/1/3/4/0/134016810/zadez-gewuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c82c3f80-c131-47d1-9585-09cf1d51dc5b/zifobukeguzixegoga.pdf
    • https://s3.amazonaws.com/regegozumekoza/96626999598.pdf
    • https://s3.amazonaws.com/jupevuxirapi/tooth_numbering_system_chart.pdf
    • https://uploads.strikinglycdn.com/files/e62db74d-fd8c-498e-86ae-f94c1b3a0677/27054815756.pdf
    • https://uploads.strikinglycdn.com/files/d554fdd9-dfaf-4d45-b334-bdf7d6d9bab1/rogue_soul_2_unblocked_77.pdf
    • https://s3.amazonaws.com/dejolavubukugeb/unsafe_abortion_in_nigeria.pdf
    • https://uploads.strikinglycdn.com/files/a7e2b886-7d20-4400-940e-e3fad4c8d443/52161156960.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc8.bin
486d4f3a4c52c0c457c352f3289e8ca749a0b2c775f7d35f1d5e58e76745413a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC8 5176 bytes
font_01_sfnt_off00007182.bin
17a1d6501ff41ba22ca1f109cd3527b81169a337ce049bf840bdb7a9bec4747b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7182 10532 bytes
font_02_sfnt_off0000959e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x959E 4324 bytes