Malicious PDF — malware analysis report

Static analysis result for SHA-256 0933dd16cf9c526d…

MALICIOUS

PDF

43.3 KB Created: 2020-09-01 20:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 635e7167f03b1f6e25bbe8b73c692022 SHA-1: cb4e31e842af1a15db273d59e54fd0d02efbc23a SHA-256: 0933dd16cf9c526dba8cd93ecc4ee657d332e2d010e9a1a9140cd6b9a0a08f96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one specifically pointing to a malicious redirector at 'ttraff.ru'. This heuristic, combined with the ML classifier's high confidence, indicates a malicious intent to redirect the user. The document body's text and embedded URLs suggest a lure related to software downloads, likely to distribute malware or engage in SEO spam.

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=best+pdf+ebook+reader+apk In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8660/9573/files/lexique_juridique_franais_arabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/3748/6238/files/original_hebrew_bible_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0521/3846/files/fubozivexavawujotojimi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/vabomufutij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1320/0282/files/nutrition_from_science_to_you_3rd_edition.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_21a93deb7d684745b30393b29845fa17.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a18aa6_08c6a8f2c9324760a8a9e6b0654cd6ca.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/97493d_7fe5bdcb81c3495481ea7ca4df3f7933.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/04c368_fffe084c36e240ea99eee10217cfac76.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0d2908_830258105f8a4a809a70e020ea01e516.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a43ec6_42c5e7716a904dc6aa24129a08e61dd8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_f9231f1f13914edfaeb8b9dcc12db2a0.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA3 5256 bytes
SHA-256: 2a83872716464e0353347cf04321878dcd85b0a8e66cbe92388b0cb5951d18d3
font_01_sfnt_off00007c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C93 10592 bytes
SHA-256: 390b8b979f6542b0d247609370b23d686bb0f66a9eb07227f58ab6e180d727b3

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