Malicious PDF — malware analysis report

Static analysis result for SHA-256 146bf15724894952…

MALICIOUS

PDF

42.8 KB Created: 2020-08-11 18:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d982f521d10348b5da1e7f7717ac649 SHA-1: 3ba5777dd147c68f42b7c872f3e092a163886caa SHA-256: 146bf1572489495220580dbf67e276a51b4e5c1bdea522cd4e005bd17366f724
154 Risk Score

Malware Insights

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

This PDF file contains numerous links, many of which point to a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=definition+of+conditional+sentences+pdf', which is flagged as a malicious redirector. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or distribute malicious content through a link farm. No scripts were extracted, but the primary malicious activity observed is the redirection to a known malicious URL.

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=definition+of+conditional+sentences+pdf
    • http://musajiza.friendsnorthcreekforest.com/uploads/1/3/0/8/130813528/1013556.pdf
    • http://files.ysifilms.com/uploads/1/3/1/4/131407632/ritopeba_risexakisix_penila.pdf
    • http://files.bgmassociates.net/uploads/1/3/0/8/130813988/mawulamomifula.pdf
    • http://files.patpetdingdongbelle.com/uploads/1/3/0/7/130776519/993444.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/2551551120.pdf
    • https://cdn.shopify.com/s/files/1/0434/7917/1222/files/85199432633.pdf
    • https://cdn.shopify.com/s/files/1/0448/8429/5847/files/69316784794.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/systematic_theology_john_frame.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/20594419722.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/38567386809.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/42751534088.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/56966374199.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/39862297094.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7802/files/tata_ace_technical_specifications.pdf
    • https://cdn.shopify.com/s/files/1/0434/8067/8557/files/xopokiku.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7549/files/61902273532.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/24443474714.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3079/files/39445440936.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_off00006920.bin
5f67b30e06405df986a6b95017c70c015c8fec9ad11f4675f720180fdb30cb76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6920 5052 bytes
font_01_sfnt_off00007a69.bin
54395e47b071b72cbfc4f72ff31ab40d1b53dc4a641b7d81fd2df9afba685a09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A69 10480 bytes

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