Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffafa0367dac5526…

MALICIOUS

PDF

45.7 KB Created: 2020-08-11 00:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2029ce28dfc0bc952f1c5cdf98c14b82 SHA-1: 43e01d677d6a9015aad819573064e91a7e81e258 SHA-256: ffafa0367dac5526fd9967e7c82a7bad194719019518da2405923045d6bc6988
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to TOEFL preparation and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to similarly structured URLs on various domains, likely part of a link farm to improve search engine ranking for malicious content. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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=essential+words+for+the+toefl+7th+edition+pdf
    • http://toxuveg.duocreationsphotography.com/uploads/1/3/2/8/132816202/4347504.pdf
    • http://madafi.jeremeleonard.net/uploads/1/3/0/8/130874493/03cf981655c607.pdf
    • http://files.z-source.com/uploads/1/3/0/8/130873921/5970914.pdf
    • http://files.moirsa.org/uploads/1/3/2/6/132681910/vinafemozire-juwaraki-fosirusimob.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/50185361320.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/dawutojugofedoti.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/9532956690.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/10429531101.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/wutakasu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7941/6473/files/13077689986.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/siwuvosekaxalegugo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/zowuvemajapur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0743/files/98647826220.pdf
    • https://cdn.shopify.com/s/files/1/0434/4135/6967/files/dictionnaire_anglais_franais_larousse.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/
    • https://cdn.shopify.com/s/files/1/0434/4135/6967/files/dictionnaire_anglais_franais_larousse

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b44.bin
014785918259d3f6f6c546dee9076e3f6ca09702c763f6577ed360ddb2ffa3a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B44 5260 bytes
font_01_sfnt_off00005d2f.bin
2d4a02105b625024ff9d4126acc605e1ffe76bc7d171ff7e8e58ee39eb2e5eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2F 7148 bytes
font_02_sfnt_off00007090.bin
f85fba7b009b43f83875c9dfb4b41cad9409303d29f955d64b03c2ace06f3c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7090 9744 bytes
font_03_sfnt_off00009224.bin
4972c892cf783310df7ebe7a43044f7b4e4d650808add06809858f2f0e6eeb09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9224 16448 bytes

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