Malicious PDF — malware analysis report

Static analysis result for SHA-256 c154e577e5aaa81d…

MALICIOUS

PDF

58.4 KB Created: 2020-08-04 17:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64a506502fb17b5571d1c46b2387329 SHA-1: 66856f3e57297e254ef4fe241a3949bee3421dc0 SHA-256: c154e577e5aaa81d410b85044441b372bfe1872f9348e82c0d8010260bf79381
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though partially corrupted, includes a URL that appears to be a lure for academic content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The primary attack vector is likely directing users to malicious infrastructure via these links.

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=bsc+zoology+notes+first+year+pdf+download
    • http://kanujit.no16cyclecaps.com/uploads/1/3/2/7/132712109/mobugoware_japeberedo_voxelutudiz.pdf
    • http://files.hillcrestbaptistchurch.info/uploads/1/3/2/7/132740987/sogewunebajireg_xebokijevifoni_majivepekude.pdf
    • http://files.themorrowreport.com/uploads/1/3/1/4/131453084/norulufozunokek_lomun_bijilevejidad_xogigumerira.pdf
    • http://nebazoge.apaveeperspective.com/uploads/1/3/0/7/130775677/xakulugukadek_bodotuzipur_werevesewuvu_kojuniratap.pdf
    • https://cdn.shopify.com/s/files/1/0434/6219/7400/files/51047134499.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/jugoteladagedir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/dr_field_and_brush_mower_parts.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/92863577566.pdf
    • https://cdn.shopify.com/s/files/1/0429/1448/0287/files/xuxijefirono.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/wolfram_alpha_integral_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0434/0334/6078/files/betepip.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6341/files/98508529026.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/vutuxoludukoxiga.pdf
    • https://cdn.shopify.com/s/files/1/0435/5129/3599/files/93023601840.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3366/files/wovuzufeximawekulogiro.pdf
    • https://cdn.shopify.com/s/files/1/0431/7600/1704/files/tila_tequila_fuck.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000757f.bin
76527e6f5bbf32d4b7694649dfa5a363d61dff2f9f5b8f59763ed90a37e53555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757F 5616 bytes
font_01_sfnt_off000088cb.bin
3ec5eaebde275098412d8dff0e1045b52b4c0e5a23abac5807418a6329e69f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88CB 3204 bytes
font_02_sfnt_off000095bb.bin
026de1076dad6614fee7b4839f066e743e4238b5ddea94259138cfcd618330b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95BB 2320 bytes
font_03_sfnt_off0000a00d.bin
e29c95859ba7221ad0a5440dcbb2310172d7c56282ed9aebd3a33b411ce3adb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA00D 11748 bytes
font_04_sfnt_off0000c569.bin
7a7e0f9cb89785dee93ecfbcc78ef93b5a18a5022886c2d5a0bf15d9412c15a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 16224 bytes

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