Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fe17aa51ef7b6f…

MALICIOUS

PDF

44.2 KB Created: 2020-07-29 11:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0df1aa52d6462f8fdba801d75bc2920 SHA-1: 2908c771e52de05347c39e81073dc9bbed7d753a SHA-256: 78fe17aa51ef7b6f9f83c47adfe572acb0f863ceb7077188de75d6486ade2411
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=dr+isaac+goiz+pdf
    • http://files.paulsfranchiseleague.com/uploads/1/3/1/4/131438249/kabuvoxije_kuvorenuzixuw_raxejusub.pdf
    • http://files.carollynkavanagh.com/uploads/1/3/1/4/131453276/8473012.pdf
    • http://files.genesiscarconcepts.com/uploads/1/3/0/7/130776511/mosenezazewarig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/4091/3046/files/perobabeverategaluviwarod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/68599023628.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/gelomasunuvisafoxano.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3763/files/75305337397.pdf
    • https://cdn.shopify.com/s/files/1/0432/9881/6150/files/wifapozap.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/levabop.pdf
    • https://cdn.shopify.com/s/files/1/0438/9430/9019/files/nogukego.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/barig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38140624907.pdf
    • https://cdn.shopify.com/s/files/1/0430/4430/7098/files/patofokubilis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9037/8903/files/38964590612.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0398/files/mogedikopovinadekap.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_off00006fb9.bin
61a4e55652469485e38454f2c1ff15ccd7a68df1c4cf6b653ff09101d82ccb8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB9 4824 bytes
font_01_sfnt_off00008031.bin
ba703bcc129314698dd965649445fb610d81f2463752e07604867059cc3d7917
pdf-font-stream PDF embedded font (sfnt) at offset 0x8031 10280 bytes