Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea358f75850d423c…

MALICIOUS

PDF

43.5 KB Created: 2020-08-05 08:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 237e6cac626db705b555c7daecdbbbae SHA-1: 385f9881433834db9d5c83631a107d42e19eea52 SHA-256: ea358f75850d423c4fd5476bf4c43485737ff71f2ce50dd298b7d0d1436de094
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'ttraff.ru'. This redirector is likely used to obscure the final destination and potentially deliver a malicious payload. The document body, though heavily obfuscated, contains the same redirector URL and references to academic PDFs, suggesting a lure to entice users to click the malicious link. The presence of a link farm further supports the malicious intent of distributing harmful 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=steven+s+skiena+the+algorithm+design+manual+pdf
    • http://kavezuxo.graceelmira.org/uploads/1/3/0/8/130874524/zarakamawakexat.pdf
    • http://files.asbjorgdesignslandscapes.ca/uploads/1/3/1/4/131438847/7ba33ac58.pdf
    • http://files.asomsanghacanada.org/uploads/1/3/0/8/130813750/masizepujegaget.pdf
    • http://fafakeset.mirandatinaphotography.com/uploads/1/3/1/3/131383664/2116d.pdf
    • http://lafok.cartoon-u.com/uploads/1/3/1/4/131453109/7735247.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/12208496537.pdf
    • https://cdn.shopify.com/s/files/1/0439/7518/0446/files/rafovez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64630415929.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/derudufofozogo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3599/8880/files/53491995496.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10217245918.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59044096386.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/dozeniwetajujivarixulej.pdf
    • https://cdn.shopify.com/s/files/1/0431/9019/0248/files/95759649208.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/93124013014.pdf
    • https://cdn.shopify.com/s/files/1/0441/3512/1048/files/azeitona_livro.pdf
    • https://cdn.shopify.com/s/files/1/0431/8252/2528/files/1991_ford_f150_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/2155/0247/files/vizeluzox.pdf
    • https://cdn.shopify.com/s/files/1/0435/7813/0593/files/jupibofusobidogijiwug.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_off00006a4f.bin
4084b0d5518410336eb25580f6f15833ab3ce63d6d0cd9df10fbd8d8b96f996b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4F 5684 bytes
font_01_sfnt_off00007d7f.bin
3c14558f94514f5bbb03e073e1800c82c3908379db42a8cb75259e8b89516b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7F 10368 bytes

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