Malicious PDF — malware analysis report

Static analysis result for SHA-256 916cf69d348b091b…

MALICIOUS

PDF

38.6 KB Created: 2020-08-31 03:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26f491b87a7d14f14859a7ac77d8c889 SHA-1: 539f6544b220db496be2aa058c8516235683a3d6 SHA-256: 916cf69d348b091beab07fea957259d48056fe9c402042db98c593d1b5b4a184
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to `https://ttraff.ru/wix?keyword=excelde+ln+grafi%25C4%259Fi+nas%25C4%25B1l+%25C3%25A7izilir`. The document body, though heavily obfuscated, appears to contain text related to Excel graphics and the malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute the malicious redirector.

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/wix?keyword=excelde+ln+grafi%25C4%259Fi+nas%25C4%25B1l+%25C3%25A7izilir
    • https://static.usrfiles.com/ugd/173616_cb0c949cef6d485aa6435ac11a89fa9e.pdf
    • https://static.usrfiles.com/ugd/9d869b_1876026c8f7848c498a05b6e4060969c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e56b2ce15c044e99ac8fe15d1b72301.pdf
    • https://static.usrfiles.com/ugd/909b15_e10e3b0fd5d4407fad9984de583849e4.pdf
    • https://cdn.shopify.com/s/files/1/0430/6157/5834/files/26883050840.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/83330122327.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/sugosevewurekulo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/bofebom.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/62012324028.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/free_timesheet_calculator_australia.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/1329169786.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9173/files/grade_1_math_assessment_test.pdf
    • https://static.usrfiles.com/ugd/b8c837_8cf06fdd122449ec81ad31ad315fea58.pdf
    • https://static.usrfiles.com/ugd/912de2_755fb0c4356a448a9a5e831947cdfaff.pdf
    • https://static.usrfiles.com/ugd/b8c837_03e7ce6df96048598ab3c47108988558.pdf
    • https://static.usrfiles.com/ugd/cf14a4_c1de8feb60d44a9386d984446726882a.pdf
    • https://static.usrfiles.com/ugd/b8c837_126fc4e8036b4a018433c4911e9352bf.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_off0000561e.bin
0f9ddb6715dfe9b6f9a6ded5d8b0852d86ed76119e7c05ec36887b0330de271d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x561E 5708 bytes
font_01_sfnt_off000068df.bin
b26ccfe3881ab2a1d61c083848615753246b1e44938107ee42f1911b676d976e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DF 11112 bytes

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