Malicious PDF — malware analysis report

Static analysis result for SHA-256 26490680a83f7556…

MALICIOUS

PDF

49.5 KB Created: 2020-08-21 14:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfd2c05b94dc90934ae821232e268205 SHA-1: 2df36c1d8e8c872e842bc1d2b78a22c21e773aea SHA-256: 26490680a83f7556ceec9ad6befdb2d2cd975d62c3b1f9265b72bcf4075ad2e3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. This URL is embedded within the document body, suggesting an attempt to trick the user into clicking it. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify, likely to obscure the malicious redirector. The ML classifier strongly supports the malicious verdict.

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=harmonize+song+never+give+up
    • http://files.qmworkplacement.com/uploads/1/3/1/6/131636697/41322fe.pdf
    • http://files.nestleinnbb.com/uploads/1/3/0/7/130775668/8d4059d1dcc00.pdf
    • http://jewaraso.d-aleksandar.com/uploads/1/3/1/8/131856072/7fe695da2346.pdf
    • http://files.lauraduggantherapy.com/uploads/1/3/1/8/131856498/gugafab_nubobaxut.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/36475807862.pdf
    • https://cdn.shopify.com/s/files/1/0436/8164/4697/files/lowes_return_without_receipt.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/41502112455.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3281/files/xmodgames_android_6._0.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/fejewuwuziguj.pdf
    • https://cdn.shopify.com/s/files/1/0436/9219/5993/files/doxinuvaposajaxidukizabe.pdf
    • https://cdn.shopify.com/s/files/1/0436/0696/6430/files/jawewuzepivurenepazodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7141/files/briggs_and_stratton_professional_series_724cc.pdf
    • https://cdn.shopify.com/s/files/1/0437/3905/4231/files/brche_klasse_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/5110236132.pdf
    • https://cdn.shopify.com/s/files/1/0430/3277/2757/files/curriculum_vitae_template_2019.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/sosugipok.pdf
    • https://cdn.shopify.com/s/files/1/0434/2307/2412/files/73567316653.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_off00007a7e.bin
21f85e598619a6f6b09a4a187f2985a823b1c14b7ed756ead7e2f47fd392d6d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7E 5180 bytes
font_01_sfnt_off00008c15.bin
3f3e1e43f0c9f3ad70bd1c60ed1e2f20ceb41ebe9d7f8d92e4505504fef17681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C15 14756 bytes

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