Malicious PDF — malware analysis report

Static analysis result for SHA-256 1300792558ccdded…

MALICIOUS

PDF

79.2 KB Created: 2020-08-01 12:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa6617fefabf920f71648e420d0528b2 SHA-1: c546c7c80fdaa04e4876705db6b0ddbfc77c8996 SHA-256: 1300792558ccddeda21f1c8302cb0722cd1725a4807b54377104a0dccb7efc3b
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 identifying it as a link farm pointing to malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=merge+sort+space+complexity. While the document body is heavily obfuscated, the presence of many links suggests an attempt to lure users to external, potentially malicious, sites.

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=merge+sort+space+complexity
    • http://files.dofnelsonfaithfomation.com/uploads/1/3/1/3/131383934/dcca73.pdf
    • http://files.richlandpac.com/uploads/1/3/2/6/132695445/boludinapod-xusodotumisome-fupixoro-wiwepibopadi.pdf
    • http://files.sfbaytherapistgroup.com/uploads/1/3/0/7/130740158/nebaziraweti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/3513589097.pdf
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/jiduba.pdf
    • https://cdn.shopify.com/s/files/1/0437/4649/2565/files/lowuxagikawagepolufawa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9580/0475/files/fiwolexinumusosikomedezuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/9664/4511/files/95432503159.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/vosakup.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/witinepenarokejufuvixiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6872/7194/files/vufezelu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/vigupovalamoweluvemoxixa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/5018614156.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/86001187974.pdf
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/20130622944.pdf
    • https://cdn.shopify.com/s/files/1/0430/2284/4067/files/leguragonixonazojipamibik.pdf
    • https://cdn.shopify.com/s/files/1/0433/1474/1413/files/ludepapixodedarawawabakod.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_off0000c736.bin
b5af20f9a5526398767231e74d93f4d5ba1c9fe157640cf6f0a26cea7a4be005		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC736 5108 bytes
font_01_sfnt_off0000d8b3.bin
d9e465d2aa008df33f6624ee1b7293872ec336968f856e316485aac99b64ce45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 15996 bytes
font_02_sfnt_off00010b2f.bin
346b2c80302ad5af3d794fcd4d551f6793108663286d8250f614892fc102bb2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 16296 bytes
font_03_sfnt_off000120db.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 4324 bytes

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