Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f33cc9499ec30a…

MALICIOUS

PDF

47.8 KB Created: 2020-09-08 00:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c31760a8ee8e40e0c323dbadb321b8d SHA-1: 44490a55e4b95754986de176aa5c72ee550ff182 SHA-256: 39f33cc9499ec30a0f43facdd60728dd986d9e268944d3ccc31ced5ec501d11b
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm. The primary malicious URL identified is ttraff.link, which is used to redirect users. The document body contains obfuscated text and embedded URLs, reinforcing the malicious nature of the file.

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.link/pify?keyword=algebraic+geometry+books+pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/bcom_1st_year_financial_accounting_question_paper_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5737/9488/files/bimikiwasepuxaref.pdf
    • https://cdn.shopify.com/s/files/1/0431/5512/8477/files/vimumomapararabavarizadam.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/zugotiwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1192/files/awdhesh_premi_gana_dj_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1147/files/ada_guidelines_2019_hba1c_target.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/timegewawisorif.pdf
    • https://cdn.shopify.com/s/files/1/0438/3889/8333/files/61641084236.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_f97a153afc51485abeae4fb1f17da377.pdf
    • https://static.usrfiles.com/ugd/097bd5_b9334459dbd84fcea2400f4f9836d907.pdf
    • https://static.usrfiles.com/ugd/143c98_09f5266561534c98a30ff737166ca2c5.pdf
    • https://static.usrfiles.com/ugd/cafc24_31fc43d62f3245df8e0abbf1cdcc376d.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_3db538d139af4254a1df739d63f37a81.pdf
    • https://static.usrfiles.com/ugd/4fea5c_35cf30f33a8845529ffc125c54c12d81.pdf
    • https://static.usrfiles.com/ugd/d216cb_8bc938214dfe4fc1be20b7abed5bfd98.pdf
    • https://static.usrfiles.com/ugd/bfd504_95f9bd21613d4fa28c6a33992dd5926e.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_off00007b8a.bin
62c7329a623d76efdb8252424403137de90f94bedc124d1c1d0c24ea94848969
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8A 5768 bytes
font_01_sfnt_off00008f27.bin
0a8e9428b214d0a6b5e036883a0331e78b2b62cb8075d510d5dd17cf61076ea6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F27 10356 bytes