Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cacf564ba1150e2…

MALICIOUS

PDF

45.9 KB Created: 2020-08-01 08:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a074422efee7fb33246291076bdc976 SHA-1: 06ab0c8650a3002965c21dc99d625a604b98232d SHA-256: 0cacf564ba1150e29aec45634f361ed600b5ff839d624599f63cee9f0b73be47
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 hosted on various domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=java+random+number+in+range'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous links and the redirector strongly suggests an attempt to lead the user to malicious 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.cc/pify?keyword=java+random+number+in+range
    • http://files.fromnaturescanvas.com/uploads/1/3/0/7/130738738/38d0074ce0.pdf
    • http://files.yueguangbaohejewellery.com/uploads/1/3/0/8/130874307/webinibad-jakasugudene.pdf
    • http://files.blainevdg.com/uploads/1/3/1/4/131437276/7646128.pdf
    • http://files.alexandrabroches.com/uploads/1/3/1/3/131379759/zatorafedonafep_xaluliwobafam_mixoja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/39403100678.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/donapolovopadamifa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/28793765081.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/8006/files/66153406442.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/bobiwedisezubab.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/93650523975.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/83075426755.pdf
    • https://cdn.shopify.com/s/files/1/0429/2814/4543/files/41169055033.pdf
    • https://cdn.shopify.com/s/files/1/0433/9974/1596/files/juzusasiduduz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0359/files/6706797991.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.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_off00007108.bin
6d54087cbfe0b6f3fd5f1a700ebe2407dace85b432510e1a36da88d0326fe1a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7108 5124 bytes
font_01_sfnt_off00008264.bin
0d07062bf2f86761cfbee0287dfa625e002282d0fecdebeb8c582e7a2b7ed5b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8264 12040 bytes

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