Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e5770a313f86c9…

MALICIOUS

PDF

62.1 KB Created: 2020-07-31 20:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9741b4f292d628fd5fd3c90b159efda3 SHA-1: 0cc864c91fd5c0a601c4be4b1f999c34076d858e SHA-256: 75e5770a313f86c99266dc2b110aaf36f4077ce7d622122660184a762a6a025c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, but the PDF's structure and the malicious URL strongly suggest 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.cc/wb?keyword=materials%20development%20for%20language%20learning%20and%20teaching%20pdf
    • http://files.harrisonandellison.com/uploads/1/3/1/1/131163667/b260f51b7b.pdf
    • http://files.asws.info/uploads/1/3/1/8/131857419/lizijamonukesetewan.pdf
    • http://files.nygreenhealth.com/uploads/1/3/0/7/130776607/xekezono-toberisiwezed.pdf
    • http://files.ollerheadcapital.com/uploads/1/3/2/7/132712214/9300602.pdf
    • http://files.trustonyu.com/uploads/1/3/2/3/132302872/4319045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/8626/6016/files/wivezuweluwexopanawugiro.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/61573307572.pdf
    • https://cdn.shopify.com/s/files/1/0432/7754/9726/files/73131757981.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/fezepumewunalatebunapag.pdf
    • https://cdn.shopify.com/s/files/1/0434/3113/3340/files/18088723817.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3714/files/88555996460.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1264/files/16300383660.pdf
    • https://cdn.shopify.com/s/files/1/0432/0293/6992/files/10783765663.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/96227703479.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/luwapawuvemutesopusojelod.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8727/files/ruxifozitos.pdf
    • https://cdn.shopify.com/s/files/1/0433/2748/8168/files/68428676103.pdf
    • https://cdn.shopify.com/s/files/1/0440/9848/6424/files/66230801376.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a79d.bin
fbbb4611cb22d9e920798688a18829bae4dbf046c43ccd2f385226c51a4ade0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA79D 5516 bytes
font_01_sfnt_off0000ba3c.bin
4026f5a85cfcd1c80f2e1dcf298b88e956bde75aa87d7681163307e4f42bce81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3C 9992 bytes
font_02_sfnt_off0000dc59.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 4324 bytes

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