Malicious PDF — malware analysis report

Static analysis result for SHA-256 09959475cf1119d1…

MALICIOUS

PDF

50.4 KB Created: 2020-08-05 15:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f835d0cf609dba67b3f160d21deb710 SHA-1: 6e7d72d4d51b86fcabe7dba9b1669cb1cfd24cd4 SHA-256: 09959475cf1119d11ff3fe745a52fd044be7052443d05e29f1bad1d3801e461e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to external PDF files hosted on Shopify and other domains, suggesting a link farm or SEO spam operation. One critical heuristic identified a link to known malicious redirector infrastructure at ttraff.ru. The document body, though partially garbled, contains the URL that was also flagged by the redirector heuristic, indicating an attempt to direct users to malicious content.

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/pify?keyword=list+of+continents+of+the+world+and+their+countries+pdf
    • http://files.tinningstreetpresents.com/uploads/1/3/1/8/131856112/zubufubugonibulepami.pdf
    • http://files.anglersforoffshorewind.org/uploads/1/3/2/6/132680922/9711655.pdf
    • http://files.corpseapple.com/uploads/1/3/1/3/131384559/bezunonupurotefosapi.pdf
    • http://files.re-crafter.com/uploads/1/3/2/7/132712235/xajazuv-nokuzikovo-tuzufisapa.pdf
    • http://files.rawpetsrule.com/uploads/1/3/1/4/131410009/mutovan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7461/6472/files/vitodelas.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/24882815887.pdf
    • https://cdn.shopify.com/s/files/1/0435/5581/5583/files/dinemutazumunetos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/jokinedus.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/basic_antenna_parameters.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/xapenezijomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wajomuxufukurojudi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/spoken_english_basic_level_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/setagejikijoreponomovori.pdf
    • https://cdn.shopify.com/s/files/1/0438/2153/1293/files/25205267132.pdf
    • https://cdn.shopify.com/s/files/1/0439/0669/5320/files/jewapuz.pdf
    • https://cdn.shopify.com/s/files/1/0440/8282/3320/files/28892142607.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/it-_201-_d_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6407/files/random_four_digit_number.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086b6.bin
deea86cb26d11866ff86749e4f1e428cb0a6d63957450f101411c5739072c820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B6 5276 bytes
font_01_sfnt_off000098bd.bin
4f091c3286d911279bd39d2b4f971cf1de8e279d52ca9e91d8d66f5006201aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BD 10136 bytes

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