Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e92369274795ba…

MALICIOUS

PDF

43.3 KB Created: 2020-08-21 23:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b29c0ef46c5230904836de92378432e8 SHA-1: ac6b5a0b02fd93223525c9dc59a5de030941e9dc SHA-256: 66e92369274795ba9bc75a34044e98ce09cd433d3d5357b0fdc6dd7270e1b763
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. It also features a large number of external PDF links, many of which point to benign Shopify URLs, suggesting a link farm or SEO manipulation tactic. The ML classifier 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=mathematical+analysis+a+straightforward+approach+pdf
    • http://gepej.yogadiversityinitiative.org/uploads/1/3/1/4/131437261/laroli_pezogijavamu.pdf
    • http://files.professionalpolishingtouch.com/uploads/1/3/2/3/132302855/xejov_dorojaxog.pdf
    • http://files.drloblaw.com/uploads/1/3/1/4/131407164/kikajigo_firerejakikavuv_sasosu.pdf
    • http://files.wfyouth.org/uploads/1/3/1/6/131607063/35f412c1e559c67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7557/5709/files/woxazotisogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9705/4631/files/94526414343.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/9612646674.pdf
    • https://cdn.shopify.com/s/files/1/0433/8299/7148/files/excel_data_entry.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxasukazojolivuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4478/1735/files/wopuzalobovidizo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2916/8282/files/27164322920.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7063/files/35643824920.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0741/files/kisena.pdf
    • https://cdn.shopify.com/s/files/1/0441/2702/7352/files/mathematical_physics_by_hk_dass_free_download.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_off00005c3f.bin
76906ea826efd3fc3b7171aaeb499e3c7c2cccfaf6809daffec51cc572c817d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3F 5556 bytes
font_01_sfnt_off00006f15.bin
84977f07789a520344d1674ceec6cff8b08db8152bfc63123b9315e63748a7cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F15 10264 bytes
font_02_sfnt_off000091db.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x91DB 4324 bytes