Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b132154e5e09bb…

MALICIOUS

PDF

36.9 KB Created: 2020-07-12 00:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb1437e931749533e7ea18efe2891c4b SHA-1: 245870227d957b3fc8fbc8210a3491096cdcd1de SHA-256: 42b132154e5e09bb5683560ba269066927a6e4cdd547ef8c9813812669169f26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF contains a significant number of embedded links, identified as a PDF link farm. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=traditional+budgeting+system+pdf'. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be SEO poisoning or redirection to malicious content through a large number of external links.

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/pify?keyword=traditional+budgeting+system+pdf
    • http://files.ajoyfulreality.com/uploads/1/3/1/6/131636845/sozixofipozikew.pdf
    • http://files.strozzistawzeeh.com/uploads/1/3/1/4/131438629/jojivuwozodebo-relevuzepam.pdf
    • http://files.michaelgerth.net/uploads/1/3/1/4/131438571/temizozukaranof.pdf
    • https://pefabujisoki.files.wordpress.com/2020/06/98443057250.pdf
    • https://rijubunaji.files.wordpress.com/2020/06/viroxafubitusorawepeg.pdf
    • https://dejatixid.files.wordpress.com/2020/07/pepelesixeko.pdf
    • https://ropowiwit.files.wordpress.com/2020/07/judukunizipapow.pdf
    • https://surefab.files.wordpress.com/2020/06/kutapajaditas.pdf
    • https://pijetodewi.files.wordpress.com/2020/07/losimokeb.pdf
    • https://sobupex.files.wordpress.com/2020/06/tisiseravisomepufowu.pdf
    • https://zazigizer.files.wordpress.com/2020/06/23336175153.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9766/1348/files/jawubebuliw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/3340515006.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vunususojorimit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055d4.bin
3d2db2d2d10e9af57977f643771841c3d522c071f7c77361c0746f7d10df2ca4
pdf-font-stream PDF embedded font (sfnt) at offset 0x55D4 5436 bytes
font_01_sfnt_off00006838.bin
8bba01c4a7603f2493ef4faf2bd04249443b42abe027a52dfc86fd8d0d818f0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6838 8904 bytes