Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fb0415114df26d…

MALICIOUS

PDF

47.8 KB Created: 2020-08-20 02:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c69b88ca8d2133790ee037acdda605a SHA-1: 2e9ace6befb9a504555495b0502f90a1dbe9dd27 SHA-256: 73fb0415114df26de627eab1ebd7265d904f3b38db48a9b388c3a8172686e578
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a malicious intent to redirect users to harmful sites. 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/pify?keyword=classification+and+properties+of+matter+worksheet+answers
    • http://virosaw.nswhand.org/uploads/1/3/0/9/130969332/3069df4e1.pdf
    • http://files.southparklions.com/uploads/1/3/0/8/130814423/zujujododip_dorigakuxik_familulu_mutepisewo.pdf
    • http://files.lonestarnstra.org/uploads/1/3/0/9/130969075/fosifavok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/5771/6119/files/nekegilotik.pdf
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/68130454951.pdf
    • https://cdn.shopify.com/s/files/1/0429/2814/4543/files/zepevogav.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5351/files/catamaran_rx_prior_authorization_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/92890669220.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/24156161460.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/pixma_ip7220_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/91945496626.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1264/files/runoguweluxusuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6230/files/96839818384.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/29048616235.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/hard_callus_formation_x_ray.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006caf.bin
5cbc578f8d20424ab82c6166e3c241afc2bd3d6ace21f4c19f238ce375c133f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAF 5364 bytes
font_01_sfnt_off00007ec9.bin
67b42bd52b8056eab8c108b1fda5dbbce36f016d882852ea12e2a513ab0999ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC9 10596 bytes
font_02_sfnt_off0000a2ff.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2FF 4324 bytes

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