Malicious PDF — malware analysis report

Static analysis result for SHA-256 6503302a43af8850…

MALICIOUS

PDF

49.3 KB Created: 2020-07-26 12:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4360da456890340f47115d1045f9f45 SHA-1: 21f0004239f9185447c6c7927898ad49195d9e8a SHA-256: 6503302a43af88502c45fd744b40ba2a871a4ecd056f9d6941dbff85ef3266c0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.ru', which is used to disguise the ultimate destination. The document body, though heavily obfuscated, appears to be related to resume templates, suggesting a lure to attract users to click on these links. No scripts were extracted, but the presence of numerous links and the malicious redirector heuristic strongly suggest a phishing or malicious redirection attack.

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=chronological+resume+template+word+free
    • http://files.rachelwoodwardhansen.com/uploads/1/3/0/7/130775387/69673e63.pdf
    • http://files.lmccpa.net/uploads/1/3/0/8/130874655/1496061.pdf
    • http://files.physicsfox.com/uploads/1/3/0/7/130776573/05ed35cd60806c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/vulinugefomutumuti.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7891/files/vukagezofiziduwum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/7571032127.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27588499931.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/7565596624.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/7729390417.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/saran.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/rateg.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/71719058450.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/71777953171.pdf
    • https://cdn.shopify.com/s/files/1/0432/4786/1928/files/64983423924.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081c7.bin
2d8eb0c7445b32c4f8d82d1d5b63a58ae3f3d23376f3064026c51b2876fc4200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C7 5564 bytes
font_01_sfnt_off00009497.bin
462a5c9202db249d506192791323a254b88a58b78eb8d3b2628a89f23b42a5bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9497 10276 bytes

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