Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d0c2889f8fc5ba…

MALICIOUS

PDF

45.1 KB Created: 2020-08-22 01:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdad223900709fcb400f71a5c52a1114 SHA-1: d9faa9a650366dbc6ae8f9af3ba3d6d21a0cac9e SHA-256: 33d0c2889f8fc5ba9740345285c21b13d36cbc7a054a1d2560ee8e0c2a8143cc
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector at `https://ttraff.com/pify?keyword=bluetooth+windows+8.+1+pro`. This URL is presented in the document body, suggesting a social engineering lure to trick users into visiting a malicious site. The presence of a large number of other PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning tactic to distribute the malicious PDF. The ML classifier also 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.com/pify?keyword=bluetooth+windows+8.+1+pro
    • http://bavure.londonpaintparty.com/uploads/1/3/1/1/131164250/b0d71196.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/ableism_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9148/files/influencer_marketing_campaign_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0438/2025/3344/files/59822458101.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/pezotaxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/cracking_the_pm_interview_gayle.pdf
    • https://cdn.shopify.com/s/files/1/0465/0657/3982/files/aiims_delhi_nursing_officer_answer_key_2019.pdf
    • https://cdn.shopify.com/s/files/1/0437/0032/2458/files/93217974368.pdf
    • https://cdn.shopify.com/s/files/1/0435/8730/5629/files/45189025799.pdf
    • https://cdn.shopify.com/s/files/1/0438/4499/3181/files/bootstrap_4_bangla_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/jvvnl_junior_accountant_notification.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_off0000733c.bin
47a7fb8c78ff529226cb1d2ac2c31fca2278d57cc2388c40fdbfe268f30e0db0
pdf-font-stream PDF embedded font (sfnt) at offset 0x733C 5256 bytes
font_01_sfnt_off00008534.bin
ddf7f716505962b621e7e3aba04a155f90b7452e3875a9ad2db33093e103a687
pdf-font-stream PDF embedded font (sfnt) at offset 0x8534 10180 bytes