Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d53aa443def5fe…

MALICIOUS

PDF

41.7 KB Created: 2020-08-04 21:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b946d586b3b3a5afd358da3fc686acf SHA-1: 2b11e0b668f5ab63f504b3fb4f0438a509a985db SHA-256: 94d53aa443def5feb117cd175b8cd867334f08889f990693eb285ba7b26bcf53
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This link is presented in the document body, disguised as a download for 'Archimate specification pdf download'. The PDF also contains a large number of external links, many hosted on 'cdn.shopify.com', suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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.com/pify?keyword=archimate+specification+pdf+download
    • http://files.davidsalter.net/uploads/1/3/1/1/131164063/56888.pdf
    • http://files.breezecounseling.com/uploads/1/3/1/1/131164047/e8eda64a13.pdf
    • http://files.skindeepinktattoo.com/uploads/1/3/0/9/130969473/7837570.pdf
    • https://cdn.shopify.com/s/files/1/0428/6811/3574/files/writing_to_a_file_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/xemiberapowaxuzuxexirap.pdf
    • https://cdn.shopify.com/s/files/1/0431/7642/7686/files/12068033190.pdf
    • https://cdn.shopify.com/s/files/1/0434/7484/5858/files/oceanography_an_invitation_to_marine_science_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/7958/2374/files/15821132438.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/44993080306.pdf
    • https://cdn.shopify.com/s/files/1/0436/9347/3947/files/xikaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/26652000460.pdf
    • https://cdn.shopify.com/s/files/1/0433/8152/2599/files/bitubewatezi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/introduction_to_electrodynamics_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/91381022579.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4677/files/piwesafafokafadeserupifi.pdf
    • https://cdn.shopify.com/s/files/1/0436/8862/4283/files/99903556605.pdf
    • https://cdn.shopify.com/s/files/1/0450/5042/9598/files/hollander_interchange_manual_free.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_off000062fc.bin
34112f8082befbb74f3fc8a8c0d84439a7a9d3bdb6d78149e6e320308f2df194		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FC 5476 bytes
font_01_sfnt_off00007583.bin
6b164927426bd8583a08379a673a0e3436f930f23fed95a15f7537f4494c3889		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7583 10312 bytes

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