Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cbdbf7c1d379c2…

MALICIOUS

PDF

43.2 KB Created: 2020-08-16 23:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2992b3a28966b292daaa2f64a3300450 SHA-1: 694b5dbd95c8f696251104d6c3f387abf9bd5b28 SHA-256: b0cbdbf7c1d379c2dfe901246aba91428e062d13dd0d56e832956935034e01a9
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a redirector, indicating a phishing or scam attempt. The primary malicious URL, https://ttraff.ru/pify?keyword=math+worksheets+grade+2+canada, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and other Shopify links, suggesting a lure for users searching for educational materials. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious redirection campaign.

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.ru/pify?keyword=math+worksheets+grade+2+canada
    • http://files.smokyridgecoffee.com/uploads/1/3/2/3/132302824/wizawawesu.pdf
    • http://files.newleaforganizingllc.com/uploads/1/3/1/8/131857071/6418065.pdf
    • http://files.waysideresources.com/uploads/1/3/2/7/132710694/7838614.pdf
    • http://files.yoganess.net/uploads/1/3/1/8/131857914/wapezavazunon_tufurizod.pdf
    • http://files.scout-troop76.com/uploads/1/3/1/4/131453674/2f5f63.pdf
    • https://cdn.shopify.com/s/files/1/0437/5756/8151/files/33432853748.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2624/files/xoboluvujudabolofiginidus.pdf
    • https://cdn.shopify.com/s/files/1/0428/2230/3911/files/3377364682.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1510/files/kebesemajukozowu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0693/files/32338367778.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/61954342214.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0815/files/novel_habibie_dan_ainun_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3935/0181/files/9443606469.pdf
    • https://cdn.shopify.com/s/files/1/0432/7292/9435/files/63747737080.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_off00006a0f.bin
50a0428dcee5d087acb4b79a076a57991dad1711cbaead86f08b4307a61839e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 5464 bytes
font_01_sfnt_off00007cbb.bin
1802bc7bd200bd2c634a796c46423b8ce2ebef1694e5fb0718a79a100d834190
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBB 10216 bytes