Malicious PDF — malware analysis report

Static analysis result for SHA-256 a444d8737a810b0c…

MALICIOUS

PDF

37.3 KB Created: 2020-08-19 02:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c2b511748010e9ad8a78ad607a7e93b SHA-1: c587983a7d19814ce4932cffb6f8bbc7255874be SHA-256: a444d8737a810b0c5456d2bef0090b5cacb1231f39fc49d390dc817d9d46c91c
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 'https://ttraff.com/pify?keyword=akai+mpc+touch+manual'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, several of which are hosted on Shopify but also include other potentially malicious domains. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, also contains the primary malicious 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=akai+mpc+touch+manual
    • http://files.afleroux.com/uploads/1/3/2/6/132681281/fakavon.pdf
    • http://doleter.savannahkitchenandbath.com/uploads/1/3/0/8/130874598/feluvuvoxelon_nopivit.pdf
    • http://seturi.vashonislandwordwrights.net/uploads/1/3/2/7/132740905/jegurilogi_giwuderamowogox_fajojuxar_sibibavazatesi.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/41365495812.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6600/files/19925217379.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/98263631593.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1326/files/suvakeridurinowerorutaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/nusuxowifufafosiwigadi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/78847177813.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/62220609452.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_off0000538c.bin
d3f4701496dd6fb2bcd60cf5fcf24c9ce19a14d731441884a15634c0e5a55967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x538C 4952 bytes
font_01_sfnt_off00006442.bin
b1df9a7f60b24338d203bbbf46aa3ef003f5b4edee8f66b65eb16ad5a60a4700		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 11236 bytes

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