Malicious PDF — malware analysis report

Static analysis result for SHA-256 712128f0c9d28f2b…

MALICIOUS

PDF

49.6 KB Created: 2020-09-01 01:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4085825062c6c99d9537a5c850ee1f2 SHA-1: 2419421a2905a879e2bb2c0dd58950676f28feea SHA-256: 712128f0c9d28f2bcfb703f5e70ae12751882c40d2d13ac56face206cd71e406
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as sheet music, which is a common lure for phishing or malware delivery. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link points to known malicious infrastructure. The presence of numerous other PDF links suggests a link farm, potentially for SEO manipulation or to host further malicious 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.cc/pify?keyword=bach+cello+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1668/1629/files/22640546468.pdf
    • https://cdn.shopify.com/s/files/1/0452/2472/2589/files/sevip.pdf
    • https://cdn.shopify.com/s/files/1/0429/4977/1427/files/47304659350.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/11647433133.pdf
    • https://static.usrfiles.com/ugd/02beb7_0dad258eac854c41b1b1cf95f365e6eb.pdf
    • https://static.usrfiles.com/ugd/7c3584_063235024eb940a7b7a8f254c046240d.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/zuzaxupatomidurepewudedij.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/rosobaxuzuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/3888/4519/files/spanish_mackerel_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/0799/0169/files/97376149283.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7474/files/electron_configuration_and_octet_rule_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0439/3048/4904/files/kaplan_nursing_entrance_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5771/6117/files/35101907520.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/18275764488.pdf
    • https://cdn.shopify.com/s/files/1/0430/5823/3493/files/public_health_nutrition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4071/files/58976417649.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f97.bin
5565e97cf3db63e67a86782b0bcd8343eb810614928818eab690130ceb849c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F97 4992 bytes
font_01_sfnt_off0000806c.bin
e513f0006476d8f4beda8ae8871bcabcb6310231688af7c2443202661325a6ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806C 10604 bytes
font_02_sfnt_off0000a4f6.bin
20dc835fdb26e5c8b2bf371a74de3f1f2251d0d540cd54084ecb3d27d8cc4587		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4F6 16076 bytes

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