Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2138cd0cacbaa8…

MALICIOUS

PDF

48.9 KB Created: 2020-08-17 07:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 306b0fb9eb878385d9639315631b3853 SHA-1: 96666b3ed7062ac6f242fe4a59eccf56f7b5717b SHA-256: 4c2138cd0cacbaa8c791ce1d3a921a192224bccbb62ef86b92960977bb4af26c
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF files, characteristic of a link farm. One of these links, 'https://ttraff.cc/pify?keyword=bodybuilding+workout+video+song', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text and a reference to the redirector URL, suggesting a lure to 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.cc/pify?keyword=bodybuilding+workout+video+song
    • http://files.globalexplorertravel.com/uploads/1/3/0/7/130775387/fovesuwogavej_derixumuxom.pdf
    • http://files.wintertonhousenursery.com/uploads/1/3/1/3/131382808/gukadukuponub-kopitubifero.pdf
    • http://files.bolinspressurewashing.com/uploads/1/3/1/3/131384442/mawof.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/nugabixazukojokiwesud.pdf
    • https://cdn.shopify.com/s/files/1/0431/4805/0586/files/xupezemudodulexevove.pdf
    • https://cdn.shopify.com/s/files/1/0439/6895/4526/files/hemostasis_casebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/wipefixanuwenaset.pdf
    • https://cdn.shopify.com/s/files/1/0433/5632/3995/files/gesop.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/uc_berkeley_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/2603/8433/files/cummins_n14_ecm_wiring_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/42394007180.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5516/files/nawupir.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7138/files/butamurosijabixugalud.pdf
    • https://cdn.shopify.com/s/files/1/0429/4852/6246/files/sowikijabaxuwekezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5770/files/miwikipoguwuzatevelasovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/lufidoveti.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://www.youtube.com/channel/UCMiN8f5QiAW
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a42.bin
b18be7234f58a7017e94a4cf2ce9625c5c4140cb58146138586e9fa4c410cd83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A42 5172 bytes
font_01_sfnt_off00006bfc.bin
161efb84b8f65afb9330bb1faeb5473dfb2869919c293b42d09328160823566b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFC 2384 bytes
font_02_sfnt_off0000756a.bin
928a53c05b56fdccacc72c00552e585b64ceef23e33fccd9f15443c4a73d9dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756A 15744 bytes
font_03_sfnt_off0000a611.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA611 4324 bytes

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