Malicious PDF — malware analysis report

Static analysis result for SHA-256 761a0fa30cbbe3f8…

MALICIOUS

PDF

66.5 KB Created: 2020-07-21 14:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8803c8196cfbfa74b25172056e0c011 SHA-1: 7ed432496c0fdea9f8581f294505c11fd59bf4e3 SHA-256: 761a0fa30cbbe3f8828b96951233799d1b6756a2ef1b7b7dd0a5198c18ed1312
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. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of a malicious redirector and a large number of external links suggests an attempt to drive traffic to potentially harmful content or to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=dart+language+flutter+pdf
    • http://files.friendscarvingclub.org/uploads/1/3/1/4/131438441/6743243.pdf
    • http://files.andreacoppini.com/uploads/1/3/2/6/132682640/1fa32f0.pdf
    • http://files.foresightencyclopedia.com/uploads/1/3/1/4/131437504/pexefukigazidiwoj.pdf
    • http://files.joanna-and-jonathan.com/uploads/1/3/2/7/132740553/xeluzoso_fekiwexaj.pdf
    • http://files.colandrcommunity.com/uploads/1/3/2/3/132302859/pijegadunefixulumol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/pitavolamukerere.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/31078288196.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/18300748584.pdf
    • https://cdn.shopify.com/s/files/1/0429/7192/2591/files/zifeporujodixuzizelupixef.pdf
    • https://zarozevebe.files.wordpress.com/2020/06/pumolofumexuzagukepoz.pdf
    • https://bibewawaluso471746960.files.wordpress.com/2020/07/42316369518.pdf
    • https://kovelika628460905.files.wordpress.com/2020/07/84442034199.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.pdf
    • https://cdn.shopify.com/s/files/1/0432/2616/9503/files/91965803857.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/41927228069.pdf
    • https://cdn.shopify.com/s/files/1/0439/0351/6827/files/87222275781.pdf
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/86369147856.pdf
    • https://cdn.shopify.com/s/files/1/0431/5096/6950/files/fivilikakixuwozinofenike.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/24855372574.pdf
    • https://cdn.shopify.com/s/files/1/0428/0903/2863/files/jedikafozotit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37357510366.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/57959277933.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b83.bin
ef0223f1fed40ad82f60aef4da7bb9b3805ad2ceb9e3b54dc23e5c270d1f8705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B83 4756 bytes
font_01_sfnt_off0000abb6.bin
87560c96094722e0b06e960fc6e6e0982e5dd9a45b3b8c8ce6a725bc3f373f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABB6 2268 bytes
font_02_sfnt_off0000b5c8.bin
360733cded63d00461149dc1dcd88317e27b209e307a9c1216f397ad826e7f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C8 15136 bytes
font_03_sfnt_off0000e5bf.bin
0e5b79f390bc9065d5ea5cf6fe93fcfbeeb2c3a25070c4fed8fd53e6e5f2ed0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 16312 bytes

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