Malicious PDF — malware analysis report

Static analysis result for SHA-256 1945321b454fb001…

MALICIOUS

PDF

41.7 KB Created: 2020-08-14 13:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78298bfab9740e69380bb2741f0d4bb7 SHA-1: 25c7aebb77526c542e2844d8bb4bfb861bd7d247 SHA-256: 1945321b454fb001528a6f1b748f07f8b89204f897866c69eaf3eeb8dcd1f934
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, it features a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection. The presence of a download button lure further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/wb?keyword=fidic%20white%20book%20guide%20pdf
    • http://files.tastefulgatherings.com/uploads/1/3/0/7/130775747/napup.pdf
    • http://kogobufew.sosossportsscoop.com/uploads/1/3/0/7/130775045/runikavegukol-xugomarabut-fezogotutezo-tagokamaj.pdf
    • http://ratijixe.fluxpilatesandwellness.com/uploads/1/3/0/7/130740189/597828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/jilobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3437/files/bipufapiwegate.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/holt_world_history_ancient_civilizations_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nitupalakisotubawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/rekazazinupugirikipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98048873934.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8735/files/glistering_melon_recipe.pdf
    • https://cdn.shopify.com/s/files/1/0435/6331/9445/files/orthopedic_assessment_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4476/files/juxasijapomeni.pdf
    • https://cdn.shopify.com/s/files/1/0437/0228/8537/files/lujafel.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6119/files/duxerogagaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/deficiencia_de_cobalamina.pdf
    • https://cdn.shopify.com/s/files/1/0436/4081/5774/files/41636973844.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ef.bin
1b3f7faea7e1fb83ef97a3095cffb9c1558fe51e740236f24eb6f890b73bb35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65EF 5152 bytes
font_01_sfnt_off0000778a.bin
fbc30bc970ddc72ed3657ef89c1dc6877476a539b3e71fe275e643fcc4b059f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778A 10080 bytes

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