Malicious PDF — malware analysis report

Static analysis result for SHA-256 834d2d3ca90430c5…

MALICIOUS

PDF

45.0 KB Created: 2020-08-06 22:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 159f36110f94bb579704c60230b7725d SHA-1: aaac90ef213dffe2cd8ed888f9f1c03e9ea58853 SHA-256: 834d2d3ca90430c5a2ad5505c0b91db59b0dd467119273e85a76915afebdcc16
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Bodybuilding workout plan for mass pdf' and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many pointing to Shopify domains, likely to obscure the malicious redirector. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this file.

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.cc/pify?keyword=bodybuilding+workout+plan+for+mass+pdf
    • http://files.karigraydesigns.com/uploads/1/3/2/7/132712558/pirexadeb_gojujazo_bezuloxeb_viluvoxaboveb.pdf
    • http://files.centenarylittleathletics.com/uploads/1/3/2/7/132740665/sasumunuxa.pdf
    • http://files.rec-writer.com/uploads/1/3/2/6/132681826/9790398.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/afmc_merit_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/sofomedexef.pdf
    • https://cdn.shopify.com/s/files/1/0438/3480/2333/files/google_analytics_advanced_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/5520/9879/files/angielski_w_tumaczeniach_gramatyka_3.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4241/files/wolopa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mobisibat.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/xujaminilip.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/33344061540.pdf
    • https://cdn.shopify.com/s/files/1/0432/4858/2820/files/78352857130.pdf
    • https://cdn.shopify.com/s/files/1/0448/4582/6210/files/convert_mkv_to_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0434/7478/0312/files/middle_school_math_brain_teasers.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9544/files/sources_of_soil_organic_matter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006461.bin
989df04c9f768a900bac1b3521574065b3c5e447070e2b7b2875b39e9e71ea8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6461 5572 bytes
font_01_sfnt_off00007742.bin
08b4d1603e826cb1bd89f840b42bcffb3f56aa1f8d818187713ed5359bbae7c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7742 9868 bytes
font_02_sfnt_off00009900.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9900 4324 bytes

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