Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c19f60f408077ad…

MALICIOUS

PDF

43.6 KB Created: 2020-08-18 23:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05944189b8a2e55e7211891c5c1f3ac8 SHA-1: 76d09322c2144e0b80020d5220ce6a491ca90e4b SHA-256: 7c19f60f408077ad43b7fbbd363d61e15ad064202cf918d122f1c139487ac7b3
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded external links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the same redirector URL and other PDF files hosted on various domains, reinforcing the link farm attack pattern. No scripts were extracted, but the primary malicious activity appears to be the distribution of malicious links.

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.cc/pify?keyword=input+output+tables+worksheet+8th+grade
    • http://files.iamauthorsonjarhodes.com/uploads/1/3/1/4/131409508/fapexerajarerovavo.pdf
    • http://tirebi.kellywriteswords.com/uploads/1/3/1/1/131164250/redenek-wafafir.pdf
    • http://files.karhongtextiles.com/uploads/1/3/1/3/131383604/2f7a7e3d.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/rabugaken.pdf
    • https://cdn.shopify.com/s/files/1/0437/7093/7498/files/63257789423.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/fepexawemugepiripapin.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/besaril.pdf
    • https://cdn.shopify.com/s/files/1/0433/5534/0954/files/larousse_livre_de_bord_orthographe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53295895336.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/afinal_o_que__business_intelligence_claudio_bonel_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5026/9849/files/bioline_laboratory_online_reports.pdf
    • https://cdn.shopify.com/s/files/1/0430/3739/3049/files/acta_constitutiva_sociedad_civil_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/sins_of_solar_empire_rebellion_mods.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055a6.bin
49b9abac49b446c5e7cab8fd115e43d41563b78f3816dc3df940c06acecfb3b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x55A6 5648 bytes
font_01_sfnt_off000068d2.bin
14d6570758dcf4e6ca55e748bd65259b184ba9caad85cb3f7d1c203394d2ddb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x68D2 10352 bytes
font_02_sfnt_off00008c0d.bin
64e13322576ebe4b9a20b8efdba1cb2c8bc01163a7c4e1ba1f667a2d7cf8e6df
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0D 16116 bytes