Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cfc8f87f6f418f…

MALICIOUS

PDF

44.4 KB Created: 2020-07-26 14:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72edebb2f828f786424a40baff109b20 SHA-1: b9e83d2c8dc74e8e8740c25694bdb93cdd0b4e81 SHA-256: 69cfc8f87f6f418fa135c559709b76217eb2e20dfc80d2894eec161f364fc875
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged the document as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content, potentially leading to further compromise.

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=bengali+movie+new+2018+free
    • http://files.pettopiakc.com/uploads/1/3/1/4/131453036/kusokojusimubo.pdf
    • http://files.leafoutak.com/uploads/1/3/0/7/130739648/rizofarovim.pdf
    • http://files.prickerpatchfarm.com/uploads/1/3/2/8/132815767/silufafujaru_gikofazexofe_sabevotex_wanugaz.pdf
    • http://files.farmhousecandle.co/uploads/1/3/2/7/132740339/zitodidexifulo-xifunifufu-zaxerulef-fitet.pdf
    • http://files.michelle-turner.net/uploads/1/3/0/8/130815277/c95943.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7338/9223/files/surej.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/95726949939.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7587/files/33103150828.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gowaluzefep.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/59105427125.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/simewajewinapukize.pdf
    • https://cdn.shopify.com/s/files/1/0429/3695/9139/files/mulumagugurapewodegujiva.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/79775842630.pdf
    • https://cdn.shopify.com/s/files/1/0431/8674/9604/files/76427183996.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1044/files/74751332169.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3784/files/derotelawufoxubafo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/16379003135.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/99495884424.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2101/files/17425216639.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_off000065af.bin
21fcaaeebe7967b4cd6efb6e191649fa9c63e209a8a7dd087a80c153dae7333b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AF 5336 bytes
font_01_sfnt_off000077c1.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C1 1800 bytes
font_02_sfnt_off00008051.bin
e12f052017e5f288600b3f7aa8bb52bf7811e59c4dffde0ed77d8f430520400e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8051 10412 bytes

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