Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c81b1189d24916…

MALICIOUS

PDF

46.9 KB Created: 2020-08-30 04:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac5428d8310981583978c3d25a3ebff1 SHA-1: 6a5b8451c824fa06b2c5a655fa715500b2dcbf7d SHA-256: d5c81b1189d2491614ebaa60b05099e0a99096b40a297f36521f8ed3422cb2af
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=1991+toyota+pickup+manual+pdf'. This URL is presented within the document body, disguised as a search result for a technical manual. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=1991+toyota+pickup+manual+pdf
    • https://cdn.shopify.com/s/files/1/0437/6032/0669/files/affidavit_format_for_lost_birth_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0433/9531/7911/files/lavazemev.pdf
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/tipos_de_anualidades_matematicas_fin.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6140/files/su_sosyolojisi_af.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5309/files/97156893978.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69651331918.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/pifemorowiri.pdf
    • https://cdn.shopify.com/s/files/1/0467/7661/5065/files/18196188559.pdf
    • https://static.usrfiles.com/ugd/d1d005_40c0a660666c4fc1a3363c59c0bacf1f.pdf
    • https://static.usrfiles.com/ugd/79e5df_7f34857a6d524329b716bbf0b2bda62b.pdf
    • https://cdn.shopify.com/s/files/1/0434/0449/2957/files/us_news_and_world_report_cars_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/disadvantages_of_centralized_information_system.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1080/files/robonenolalil.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/aetna_medical_claim_reimbursement_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/a_streetcar_named_desire_download.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_off00007209.bin
5a1a0930f5f5bcf02061113064efd35d1babe33549a694769287d21c27f0ccd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7209 5308 bytes
font_01_sfnt_off00008417.bin
1d17b84fd8b958560ecd04fa98f7c968b833992224d640d799c423d9d9350479
pdf-font-stream PDF embedded font (sfnt) at offset 0x8417 13372 bytes