Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a24d6e3aa6f29ae…

MALICIOUS

PDF

44.4 KB Created: 2020-07-29 15:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a0242bc38798a304f2babd799bd29d2 SHA-1: 3d4809afb448b990622d0aced0ed311479e51d20 SHA-256: 6a24d6e3aa6f29ae5dc6a644b4174270b47c565bfca95e3bd4240833ea741464
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=alendronate+davis+pdf
    • http://files.julieriveradesign.com/uploads/1/3/1/4/131482941/jotoku_furefibumexu.pdf
    • http://files.bulkleyvalleyhoney.com/uploads/1/3/0/7/130738803/gujugowop_fapizonepoke_gesoted.pdf
    • http://files.chefscommissarykitchen.com/uploads/1/3/0/7/130774968/efca2bab2345a2f.pdf
    • http://files.sarah-styles.com/uploads/1/3/1/3/131379296/xedinejufu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6318/1463/files/43020229570.pdf
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/woxofowomuxunirimetonen.pdf
    • https://cdn.shopify.com/s/files/1/0432/9376/9894/files/11995880485.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/kekukipef.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/7118182150.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/bamemix.pdf
    • https://cdn.shopify.com/s/files/1/0431/5096/6950/files/73020950129.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/wogusivafodewiparegudo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/rikijaju.pdf
    • https://cdn.shopify.com/s/files/1/0434/2379/3308/files/beximadisibis.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/retedonufitisuvugi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tizisixurodegu.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_off000070fd.bin
370b4781bb02e7b8d872b806a3be51b04fd43ab1a60ca59c9f9d66acc7d0d6ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x70FD 4872 bytes
font_01_sfnt_off00008198.bin
1668259f61b7ac673e6bb0ce9fceaf508217ad2fbf23ac822ebdf1604554c7d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8198 10256 bytes