Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4aba172f0ba5102…

MALICIOUS

PDF

41.6 KB Created: 2020-08-23 08:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fa7d9bec5e1ca651e7360364a6ca65f SHA-1: 7fd7bf9077fc3acd573e66d17c8e424fad667b96 SHA-256: b4aba172f0ba5102fd911d79d50927a148ec252741360729012efea9393c20a4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bella+durmiente+cuento+original+pdf. This indicates the document is designed to lure users to malicious sites, likely for further exploitation or credential harvesting. No scripts were extracted, and the document body was largely unreadable, but the heuristic firings strongly suggest a malicious link farm attack pattern.

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=bella+durmiente+cuento+original+pdf
    • http://bigpinelumber.com/uploads/1/3/1/4/131454549/68d173392a91.pdf
    • http://files.ellicottconsulting.com/uploads/1/3/0/9/130969984/28747f11fd129.pdf
    • http://files.artshotz.com/uploads/1/3/0/7/130739177/697adf95773b.pdf
    • https://cdn.shopify.com/s/files/1/0430/5823/3493/files/7592200376.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/2017_little_league_rule_book.pdf
    • https://cdn.shopify.com/s/files/1/0449/5795/8299/files/1000_solved_problems_in_strength_of_materials.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/wukikuleduxuzow.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7185/files/14002129281.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4780/files/xavekufegipuwijilo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/alkyl_and_aryl_halides_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/4158/6332/files/viwag.pdf
    • https://cdn.shopify.com/s/files/1/0438/6013/2005/files/rakixovexagopab.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_off000061cf.bin
80c9527052e2a026b8b8c26dfa3ee4b2c3e2bd499ade6aed420d22ed30f503f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x61CF 5344 bytes
font_01_sfnt_off000073e3.bin
34c12e925d79dec9bfaf49ff304fbf4ce7789a992268946a71288125abff3f43
pdf-font-stream PDF embedded font (sfnt) at offset 0x73E3 11152 bytes