Malicious PDF — malware analysis report

Static analysis result for SHA-256 c807fa1aeabd5b16…

MALICIOUS

PDF

45.7 KB Created: 2020-09-01 10:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6406d4fa21c39f5e670f2c7d4a3706e SHA-1: 4c1ece854ebabb786db72ef22ab37a23e0e3c821 SHA-256: c807fa1aeabd5b169ec54286c460ed560cb3689e1fa7fc82bb7ead68a11b742b
152 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.ru'. The document body, though heavily obfuscated, contains text related to 'free movie night flyer template microsoft' and the malicious URL itself. The presence of a large number of embedded URLs, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF. The ML classifier also strongly flagged this PDF as malicious.

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=free+movie+night+flyer+template+microsoft
    • https://cdn.shopify.com/s/files/1/0436/5081/0014/files/mabusowizifirope.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/93230058067.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/65283003473.pdf
    • https://cdn.shopify.com/s/files/1/0463/3414/8763/files/newagamupaxileve.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/vivaldi_four_seasons_spring_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nexunalazuzifoginiwaboliz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/tidagadegiwuxive.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0090/files/blocking_android_number_on_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/94874367299.pdf
    • https://cdn.shopify.com/s/files/1/0434/4178/2946/files/sepsis_3_guidelines_summary.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_off000073f1.bin
b4b2c9160e2b8c1e798e841d5a4e9f472d1200491d4bef0c99566987150cdcdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F1 5548 bytes
font_01_sfnt_off000086bd.bin
131c9efac628eb13eb086dbb876d975626a4d56c18585f38fd5dfdcf2b5b4209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86BD 10400 bytes

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