Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd205a7a29863a0…

MALICIOUS

PDF

48.4 KB Created: 2020-09-07 01:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5df677582109909d2b06f63f01ba93c SHA-1: dea069874def6597979bb9f295e9035eadb97530 SHA-256: 4fd205a7a29863a0441347da3ca25f754cafcb4f6c4ec1f25c5216e9d2142791
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large external link farm. The primary malicious URL identified is 'https://ttraff.link/wix?keyword=afmc+admission+2019+form', which is likely used to redirect users to a malicious site. The document body contains garbled text but includes the same malicious URL, reinforcing its purpose. The presence of numerous external links, including benign ones from Shopify, suggests an attempt to manipulate search engine results or distribute malicious content through a large number of URLs.

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.link/wix?keyword=afmc+admission+2019+form
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/hypertension_guidelines_american_heart_association_2017.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1512/files/skyrim_lovers_lab_defeat.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0122/files/xoteb.pdf
    • https://cdn.shopify.com/s/files/1/0429/3971/1644/files/kivozarobapupokev.pdf
    • https://static.usrfiles.com/ugd/5ecadc_9aa4c23eacd4424fb02ef0964090877d.pdf
    • https://static.usrfiles.com/ugd/fd7405_2b850fb8e3af42bd95d015ff5a44ede2.pdf
    • https://static.usrfiles.com/ugd/7f16bd_bb20389e8da34f179edbe317329a31bc.pdf
    • https://static.usrfiles.com/ugd/7f929b_aed7610edd7546e8b0346b758d5eb229.pdf
    • https://static.usrfiles.com/ugd/a58b01_b5da26231a8b47b0bcc3a8d072f2ad7b.pdf
    • https://static.usrfiles.com/ugd/b5aed9_411cff8e7cc8427e9d13c71b0f932cba.pdf
    • https://static.usrfiles.com/ugd/0af078_33efe1a7081e4387b795c8d61231e2db.pdf
    • https://static.usrfiles.com/ugd/808cd0_e600cf59496443c7b2f0f1ad68987b2d.pdf
    • https://static.usrfiles.com/ugd/c3f59f_92eae6926737437da68802b0f22c2de3.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_4cfcbed55bd448deba232440e4028654.pdf
    • https://static.usrfiles.com/ugd/86319b_d29cb13f757341d99a17a9f7329a995f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006918.bin
e60961d9a77223c6f8d2297121464c6a7d0e657abbcacba4d6e76e1d5669ee29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6918 5604 bytes
font_01_sfnt_off00007c17.bin
e07cafe41f23f09eb9aefecd49bdfa7e0ebbc337fe684c27157002aeead67bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C17 10312 bytes
font_02_sfnt_off00009f9a.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9A 16164 bytes

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