Malicious PDF — malware analysis report

Static analysis result for SHA-256 66aa199dacc03569…

MALICIOUS

PDF

45.6 KB Created: 2020-08-03 12:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5a82eba4746787a079e78f67d48c249 SHA-1: ebd91dee5c71be2e0d4cc434f95165f57a170704 SHA-256: 66aa199dacc03569f4e2b7271325069bcddf063f8acda643d1627f5093a1f289
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a large number of embedded links, many pointing to external PDF files hosted on various domains. One of the primary links, 'https://ttraff.cc/pify?keyword=bootstrap+4+w3schools+pdf', is known to be malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise its true purpose, likely related to SEO link farming or distributing further malicious content.

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/pify?keyword=bootstrap+4+w3schools+pdf
    • http://files.canuplaysports.com/uploads/1/3/1/3/131379663/3416210.pdf
    • http://files.ftrs.ca/uploads/1/3/1/0/131070009/nuduniwugubibusa.pdf
    • http://files.maineartsedresources.org/uploads/1/3/0/7/130775201/3935818.pdf
    • http://files.thisgirlisawesome.com/uploads/1/3/2/6/132695698/wogekijogiz_nuzuxukititub_pigubufurik.pdf
    • http://files.animalfineart.co.uk/uploads/1/3/0/9/130969965/muxeru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17612659915.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/xikewizunotu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8282/files/vezewuketunifoduxifub.pdf
    • https://cdn.shopify.com/s/files/1/0435/8373/3915/files/10616361123.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4700/files/revajalanosodul.pdf
    • https://cdn.shopify.com/s/files/1/0440/7099/4085/files/kasamunerivojuwuji.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/nirirojaxaresumunojo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2057/3080/files/40185758369.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/67481194305.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/6594562416.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/801671961.pdf
    • https://cdn.shopify.com/s/files/1/0434/6914/4230/files/fifekitadusimaga.pdf
    • https://cdn.shopify.com/s/files/1/0434/6888/2072/files/kejasekezaka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30551251375.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/8065614212.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_off000067b1.bin
60883a589befa33e924562eabf734f4253406b39607478132decad8c36ac2598		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B1 5636 bytes
font_01_sfnt_off00007af3.bin
98f544f82d4e3622acdc6c23b938daba79362be5017d908d424ff9039dc546df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF3 14964 bytes

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