Malicious PDF — malware analysis report

Static analysis result for SHA-256 6163523602dfea0a…

MALICIOUS

PDF

36.9 KB Created: 2020-08-30 16:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecaa4109ebaed7a7b69bac00c587b83f SHA-1: 22603b6b97d2b37c2d5468d5f5432ba86f06a729 SHA-256: 6163523602dfea0ae3cf4f2cd3289b3a5407b43ac92a0be5bacb7fea24453f6e
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for 'Ashrae 62. 1 pdf download'. This link points to 'https://ttraff.ru/wix?keyword=ashrae+62.+1+pdf+download', which is flagged as a known malicious redirector. The document also contains a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness.

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/wix?keyword=ashrae+62.+1+pdf+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/advanced_level_mathematics_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/xoxeruremowetaligevamafoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/mevosibadameputati.pdf
    • https://cdn.shopify.com/s/files/1/0433/0894/1467/files/mcdonalds_wifi_connect.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/17587731705.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/62302603461.pdf
    • https://cdn.shopify.com/s/files/1/0428/5543/2348/files/zelutomugenodojizodowe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/graphic_novel_exile_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6089/4627/files/name_change_checklist_after_marriage.pdf
    • https://cdn.shopify.com/s/files/1/0448/6764/9698/files/gestion_de_calidad_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0445/6588/9188/files/bpsc_mains_question_paper_of_maths.pdf
    • https://cdn.shopify.com/s/files/1/0434/6649/0006/files/kosadedubajekifagupof.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/51279031641.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2159/files/46731737686.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_off00004ee5.bin
bd54ee3b8ec38dd9ff17b5e2af4914245d03a9923f7fda65c2dfa2cfa9e089a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE5 5580 bytes
font_01_sfnt_off000061f4.bin
0320a88cbc96c56aeb7c54fa91ffb83107985a1221eef45f0245c081b6cc0da7
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F4 11276 bytes