Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7174ed994160e24…

MALICIOUS

PDF

40.9 KB Created: 2020-08-12 03:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3c584a17f4acfbe8c5bb9709c09a66a SHA-1: 1e59b82aa0cb52bd4b9fe525651073df47e64a65 SHA-256: a7174ed994160e24f04e6ff5b3c9868931f6c218345461d3dbce4500abc21284
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as an IELTS exam paper. The document body also contains this URL and numerous other links to Shopify-hosted PDFs, forming a link farm. The ML classifier strongly indicated maliciousness, and the PDF structure with embedded links supports a social engineering attack.

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/wb?keyword=ielts%20exam%20paper%20pdf%202017
    • http://pitupike.srpdesignstudio.com/uploads/1/3/1/4/131453850/kigevuwep.pdf
    • http://files.tbcsr.com/uploads/1/3/0/9/130969053/pewawunak.pdf
    • http://files.sarafarhat.me/uploads/1/3/0/9/130969709/tigobid_filuragufevoli_pozasuropawebo_labululerazu.pdf
    • http://dulorafuw.joyfulsoundchoir.org/uploads/1/3/2/6/132682883/bakorufedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/90759773263.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8984/files/53798887727.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/jutifazon.pdf
    • https://cdn.shopify.com/s/files/1/0434/3401/6924/files/43522508449.pdf
    • https://cdn.shopify.com/s/files/1/0431/4680/5404/files/domifexikikuladuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/bwv_846_score.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/chihuahua_weight_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/christian_theology_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/wajemoxib.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/16018335768.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/4629304736.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/87833771269.pdf
    • https://cdn.shopify.com/s/files/1/0450/6284/8664/files/applied_psychology_in_human_resource_management_7th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1517/files/verb_noun_adjective_and_adverb_list.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_off000061db.bin
c3331d393ca591b289f8963e7424482530f2800bf0c744e085eb0b75c8957d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DB 5596 bytes
font_01_sfnt_off000074dc.bin
a524a7218463f0f4fedc523f4bf216fca357f64fa2de761daa58600bc8de4d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DC 9932 bytes

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