Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa9ce5457ef9a93…

MALICIOUS

PDF

43.8 KB Created: 2020-09-01 18:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39f2c2ed7ed629f97155366729e7f512 SHA-1: fd8b0ea8f9573bc3b16b087dd344f491bbc659dd SHA-256: bfa9ce5457ef9a932ec20cc9aca677b7d9cbe59f41e8a7ebc540b29e61a43c44
152 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.me, which is likely used to deliver further malicious content. The document also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning tactic. No scripts were extracted, but the presence of the malicious URL and the link farm heuristic strongly indicate a phishing or redirection attempt.

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.me/wix?keyword=9+ball+billiards+game
    • https://static.usrfiles.com/ugd/b8c837_7b096c093df247f990f3b43c424a6382.pdf
    • https://static.usrfiles.com/ugd/b8c837_f41957d4c934435c9073354f6dd72eb5.pdf
    • https://static.usrfiles.com/ugd/07625c_2a4356ccd43a4d6eb139ee10f91172cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa2cf6b96ada42b1abdcefda0868898e.pdf
    • https://static.usrfiles.com/ugd/1ee69b_e06b9b847de0434e8c84637b99f9e16b.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/multiplication_and_division_of_binary_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0435/9425/2456/files/bteup_final_marksheet_2018.pdf
    • https://cdn.shopify.com/s/files/1/0435/3441/8075/files/88357403675.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/angelology_danielle_trussoni.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/babavab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugifewelogukepebokiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/zosibugotuzudibuvutab.pdf
    • https://cdn.shopify.com/s/files/1/0462/7061/1613/files/social_psychology_aronson_8th_edition_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/bovobojefaf.pdf
    • https://static.usrfiles.com/ugd/ad2ade_598192a659a2428f8ede3f2abea0f325.pdf
    • https://static.usrfiles.com/ugd/a18aa6_92de575a5c924bc2ac3037cee260c993.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_off00006e03.bin
da67012477b3bf30f3b38c7f0dfdaa7004237071a70a39f056fc14df388320ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E03 5348 bytes
font_01_sfnt_off0000800f.bin
c12a24e8894c51744136b76ca50bc2a6e99962e1ebacfbb4b87a2b03b15c8aa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x800F 10156 bytes