Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d5dbd81497a041…

MALICIOUS

PDF

41.0 KB Created: 2020-08-24 06:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e868711494df591f21ce809c884077ac SHA-1: f95d9840e320b3d6ccc44916669ac34aeeb4145e SHA-256: 52d5dbd81497a04196564a1e0f69dec4d348a0008e58c76f53ab83087dcef693
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm pointing to numerous PDFs hosted on Shopify and other domains, with one primary link to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to a 'ruled paper template', suggesting a lure. The presence of multiple embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a coordinated effort to distribute malicious 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=ruled+paper+template
    • http://taxegepa.keepitstraightsis.com/uploads/1/3/0/9/130969336/0ada019d9f0e.pdf
    • http://files.bacalandersengarrison.com/uploads/1/3/1/3/131384127/tigopipavaju.pdf
    • http://bogedu.lindsay-hamilton.com/uploads/1/3/1/6/131606066/a456d8d4b1.pdf
    • http://files.amyowendoulaservices.com/uploads/1/3/1/1/131164048/jamomigekuzup_fobad.pdf
    • http://xakerilad.biesyiczadyfci.com/uploads/1/3/1/4/131438800/ae80d265.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2633/files/silencer_dota_2_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/agile_scrum_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/6469/6732/files/asking_the_right_questions_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/vogef.pdf
    • https://cdn.shopify.com/s/files/1/0436/0421/3917/files/zebejugedesijonaba.pdf
    • https://cdn.shopify.com/s/files/1/0433/7693/5068/files/understanding_the_linux_kernel_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/arcgis_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9074/7293/files/grade_5_math_equivalent_fractions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/ocarina_of_time_3d_strategy_guide.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_off000064b5.bin
729c5910ef52ef5fc029105f554f5a0d1702f1a84affcfa515809dfd4c98ebb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B5 4936 bytes
font_01_sfnt_off0000756c.bin
17d6149624beeb170a86db948becb8ee7af173ac839da7850d7949fca2e3a4e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756C 9956 bytes

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