Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab93e0fa62e44df9…

MALICIOUS

PDF

44.5 KB Created: 2020-08-10 22:39:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e65c3402da87bc126542e1c3c85519fe SHA-1: e92a48583ad1dc56d131e092d1d4e6a1161f8b90 SHA-256: ab93e0fa62e44df9be94cb355c7df519f6447744f075140e65278b94b1f0549b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to disguise the malicious intent. No scripts were extracted, but the primary attack vector appears to be directing users to malicious sites via embedded links.

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=roman+catholic+encyclopedia+1940+volume+8+pdf
    • http://tavulop.aicheucr.com/uploads/1/3/0/7/130740013/suxomabuk.pdf
    • http://puzorozep.alexandrakohutcole.com/uploads/1/3/1/6/131636725/223471.pdf
    • http://files.phsdbteam.com/uploads/1/3/1/4/131407958/682254.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/xinunapobizezizimemabaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muxajuvorupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1605/2123/files/69875203488.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0820/files/38540802529.pdf
    • https://cdn.shopify.com/s/files/1/0435/3048/5915/files/9222779718.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/50038682378.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/lafakapexolobelubopote.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/doxujuduzukogis.pdf
    • https://cdn.shopify.com/s/files/1/0437/1480/5914/files/pandoc_markdown_to_latex_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/vidibozafodila.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/tituladajopizizisix.pdf
    • https://cdn.shopify.com/s/files/1/0433/4767/3253/files/namemazuganifatiwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/wolatekopejugedulixorol.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/characteristics_of_neolithic_culture.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_off00006e3e.bin
66e8bfa301615d618681c60ecfcbb7b96697013bcbd2bf2428fe42e9b82dbe3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3E 5920 bytes
font_01_sfnt_off00008257.bin
2f5f577e51c75b56e377f36ac21e80fc86e56095a69a12b8006d963ed3a0af2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8257 9980 bytes

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