Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4b922f6380e0de…

MALICIOUS

PDF

62.9 KB Created: 2020-08-04 10:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f91625810bdbdf29aac33fffd62c5c93 SHA-1: e5a247254db5359a67cbc39d52027b692f468fde SHA-256: 5b4b922f6380e0dec97b5c26873c0f5c625521736130081c65cad4330aa37bc5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of multiple PDF links points towards a link farm or SEO scam.

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=arabic+pdf+characters+are+disjointed
    • http://files.virtualchip.com/uploads/1/3/1/0/131070751/midig.pdf
    • http://files.fccdks.org/uploads/1/3/1/0/131070718/nibisixabelej.pdf
    • http://files.impunity.site/uploads/1/3/1/4/131438449/xejupufazaturiv_nuduwaxokuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/dagoxulotop.pdf
    • https://cdn.shopify.com/s/files/1/0440/7446/7478/files/hand_lettering_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/biduju.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/daxosuxizutijasex.pdf
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/61215914641.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6261/files/61218232927.pdf
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/nosobatujazesinijiwub.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9504/files/40740938410.pdf
    • https://cdn.shopify.com/s/files/1/0433/2929/0390/files/tofizepixunarepaxonom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/78941378999.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9520/files/volamaz.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000cde6.bin
606668afddf8f67556304f2fa1a6e176f78b5c354b13c0513889eea7b10c1605		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCDE6 19588 bytes
font_00_sfnt_off0000861e.bin
69643e411378bdf686d59d74ffeb29f3019308fb599fc5ecd8cafddf16194320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x861E 5416 bytes
font_01_sfnt_off00009885.bin
d382b9552e38b6b31b4c9b7d6eaceed436248d64586bdd7cc6af2c5d9277d2dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9885 17092 bytes

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