Malicious PDF — malware analysis report

Static analysis result for SHA-256 c335cac8e1c174b7…

MALICIOUS

PDF

40.9 KB Created: 2020-08-10 17:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4f8ba11159ef173fd51b5036e9ecc76 SHA-1: 4e5cd064af81e2f9c61daee4fc73f7dfb6d4e2c9 SHA-256: c335cac8e1c174b7d1aecb2ddca3bad62e10d70bc3436e66c0d718669a393e0b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to PDF conversion and includes the malicious URL. The presence of numerous external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites. The primary malicious URL is used to redirect users, likely to a phishing or malware download page.

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.ru/pify?keyword=adobe+acrobat+pro+convert+scanned+pdf+to+text
    • http://gitari.worlandshootingcomplex.com/uploads/1/3/1/4/131407222/boguxizasolon_lineruwa_nipevoxu.pdf
    • http://zisid.openmindfashion.com/uploads/1/3/1/8/131856462/zagosuvega_fosovin_jafanesazu.pdf
    • http://files.graywaycreations.com/uploads/1/3/1/4/131482821/35b0b48d7.pdf
    • https://cdn.shopify.com/s/files/1/0430/7818/9205/files/rapusufokafo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1982/8386/files/tepejebusuwefifa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/general_characteristics_of_english_language.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/64863439354.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/red_orb_pixelmon.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/faxosotoxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5566/8639/files/80020675441.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/nixotopedilirivukudul.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/highster_mobile_apk_cracked.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2821/files/pupiwixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/54795411403.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61286624564.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/buxem.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_off000061a6.bin
a34a185c78b51d7a4597a965b2d5c92dab8db70f872466a6ad0273cb77ec3ecc
pdf-font-stream PDF embedded font (sfnt) at offset 0x61A6 5376 bytes
font_01_sfnt_off00007401.bin
68179f3a5f1ab83112f69aeb1dcd5c5f8d81d812ff983afc682882bab8cd8e53
pdf-font-stream PDF embedded font (sfnt) at offset 0x7401 10108 bytes