Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1398c3406da189…

MALICIOUS

PDF

58.6 KB Created: 2020-08-03 07:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 095bbc2e7d0e8cd036b2c9e14c6ad2ae SHA-1: eec50867e5e93d932cc438e08332bef963702347 SHA-256: 1e1398c3406da189f6f5b5310b6ba7d22caff92e4a939becad50280b5845a33d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=free+wonderlic+test+pdf'. This URL is presented within the document body, suggesting a lure to trick users into clicking it. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, indicates a link farm designed to improve search engine ranking for the malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=free+wonderlic+test+pdf
    • http://files.mymealwormsfarm.com/uploads/1/3/0/9/130969046/nutitosizufij-lapapuvajaxul.pdf
    • http://files.mcadoos.ca/uploads/1/3/1/3/131381539/815657db0d361.pdf
    • http://files.ecorocca.com/uploads/1/3/0/7/130740097/javuzunelupides.pdf
    • http://vafeda.pumpernickelpictures.com/uploads/1/3/1/0/131069899/e8d0b21.pdf
    • http://files.samanthianixon.com/uploads/1/3/0/8/130813922/4382334.pdf
    • http://files.ecorocca.com/uploads/1/3
    • https://cdn.shopify.com/s/files/1/0435/0436/9816/files/74407265523.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/late_night_speacial.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/75139009732.pdf
    • https://cdn.shopify.com/s/files/1/0439/8995/8814/files/ramamutosidamapubirufuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/3751/4133/files/python_string_substring.pdf
    • https://cdn.shopify.com/s/files/1/0429/3804/0487/files/rumedamuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/bilibefedakanuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1311/9905/files/46166698651.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1687/files/vifefetavexejufaleb.pdf
    • https://cdn.shopify.com/s/files/1/0436/9825/8088/files/letatugotal.pdf
    • https://cdn.shopify.com/s/files/1/0429/0795/9452/files/5996431404.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/559_425_8820.pdf
    • https://cdn.shopify.com/s/files/1/0439/5961/5646/files/65491072623.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b74.bin
9d5e05e9e7174c911c495c103ff416549475c05366b54cee8ea27db06047df53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B74 3016 bytes
font_01_sfnt_off0000862e.bin
5688739dad902218d0b680548e1c86e1a9cd52bf34751a6db51e250f9ab4b736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x862E 4988 bytes
font_02_sfnt_off0000974d.bin
0cd0aea77bc829a15e24bc95a4397c64a7a33f15309163c9f2f0b820faabc884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x974D 15220 bytes
font_03_sfnt_off0000c772.bin
179678041edc4cdaae8c19736afc37a9524181cba276a02997144ab90296486b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 16088 bytes

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