Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ab73a0d1fc7156…

MALICIOUS

PDF

41.2 KB Created: 2020-08-05 16:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bae6090dfe269da8359699cb82400f3 SHA-1: da0e5483dc115fc6d628da306a21cc8322251c97 SHA-256: 91ab73a0d1fc7156792c4967967b2184d0cc8002da4de6d9220b8c78ea44aee2
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a cerebrovascular event treatment guide. The link `https://ttraff.cc/pify?keyword=evento+cerebrovascular+isquemico+tratamiento+pdf` is a known malicious redirector. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm for SEO poisoning or traffic generation. The ML classifier strongly indicated maliciousness.

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=evento+cerebrovascular+isquemico+tratamiento+pdf
    • http://files.magiqatlas.com/uploads/1/3/0/8/130814513/zivatemurijupizowigi.pdf
    • http://files.precisionpitching.net/uploads/1/3/1/3/131379110/bd97a6586c.pdf
    • http://files.bodycompcryo.com/uploads/1/3/1/3/131383892/8413872.pdf
    • http://files.rachelsweetdesign.com/uploads/1/3/2/7/132741385/wisutap.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/48603283215.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30740110423.pdf
    • https://cdn.shopify.com/s/files/1/0428/5156/5724/files/niv_1984_bible_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1972/2152/files/87292887360.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1089/files/rizukilupijuzagumosote.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/pmbok_latest_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/woguzapasaluruxaluvokotug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0093/files/37830925171.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/48923452368.pdf
    • https://cdn.shopify.com/s/files/1/0445/6172/7647/files/core_my_controller._php.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/mitodebipojilinotiwimix.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6071/files/69706951730.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/28890754160.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/darinimojij.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fad.bin
19c6f59825972d9a043bbee7bf6d716cf639cfe1b71974d5250c3bd30a5eed93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 5584 bytes
font_01_sfnt_off00007295.bin
03b47d8809591b23d1262ab5681715e1c648d937b44250632fe46f4efcf316bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7295 11048 bytes

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