Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c46b21df72bd01a…

MALICIOUS

PDF

41.4 KB Created: 2020-08-22 21:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d5994360b771438a31b9852079c1723 SHA-1: 6f66d98d4204cd048ddcbf5e808ae6807f65804f SHA-256: 9c46b21df72bd01a6639c170c198f1a628151c4b7d365736da727967f012751d
152 Risk Score

Malware Insights

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

The PDF contains a lure for "Gmail dark mode version apk" and embeds multiple links. One of these links, ttraff.ru, is identified as a malicious redirector. The PDF also functions as a link farm, pointing to numerous other PDF documents hosted on various domains, many of which are benign but likely serve to obscure the malicious intent. 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=gmail+dark+mode+version+apk
    • http://files.banyantreeyt.com/uploads/1/3/1/4/131452958/2939273.pdf
    • http://lamatefas.shellystill.co.uk/uploads/1/3/1/0/131070161/f0bc0c86990cbf.pdf
    • http://files.artbycjroughton.com/uploads/1/3/1/4/131406717/nevulosudog.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6596/files/vesifakese.pdf
    • https://cdn.shopify.com/s/files/1/0435/3160/0031/files/73238905371.pdf
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/poloselunowa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/ensayo_arquitectura_sustentable.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/interview_tips_for_teachers.pdf
    • https://cdn.shopify.com/s/files/1/0432/6968/5414/files/characteristics_of_a_christian_leader.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5792/files/business_card_template_illustrator_with_bleed.pdf
    • https://cdn.shopify.com/s/files/1/0432/2076/2783/files/kundli_matching_app_for_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/fatowexexanobonozinu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2195/1391/files/mission_impossible_ghost_protocol_imdb_parents_guide.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/
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/fatowexexanobono

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062cb.bin
f4adf5cc2a938e7715ff134d3eaf81d6852b32b5aeb1d4be69406d3c4400b358
pdf-font-stream PDF embedded font (sfnt) at offset 0x62CB 5260 bytes
font_01_sfnt_off0000749a.bin
bd010de37bd0229c2744154181572bcc0eae50bfd5e9478296fbc25270d8cd32
pdf-font-stream PDF embedded font (sfnt) at offset 0x749A 10592 bytes