Malicious PDF — malware analysis report

Static analysis result for SHA-256 9320103255cff7c4…

MALICIOUS

PDF

54.9 KB Created: 2020-08-12 11:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c6d8f6f7579b165d9a32e75c942c948 SHA-1: 5e90f25a89deecba551233f2b939f744db54b324 SHA-256: 9320103255cff7c48aec23f79b94378840a386c8b9ce3f99a540baedee765921
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=installment+sales+contract+pdf'. The document body, though heavily obfuscated, contains text related to 'installment sales contract pdf', suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=installment+sales+contract+pdf
    • http://files.deltabluesfestival.net/uploads/1/3/1/6/131636914/feriputemat.pdf
    • http://files.zakuromedia.com/uploads/1/3/1/8/131856276/busela_wematek_devomezad.pdf
    • http://jasig.askmarct.com/uploads/1/3/1/6/131606289/3272617.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/gem_install_proxy.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/3_day_muscle_gain_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0435/2573/4552/files/kiziputajoxigugakalosipo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/brownells_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/78371505832.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/67572549472.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/zajoxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/vofekewiredekowozarufag.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/ninapigepufukira.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/16167894216.pdf
    • https://cdn.shopify.com/s/files/1/0430/4797/7114/files/belajar_tajwid_untuk_pemula.pdf
    • https://cdn.shopify.com/s/files/1/0449/7879/8750/files/alleluja_mio_twa_nuty.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_off0000682f.bin
aef05b0e9ddf2642f90ad3ffec95f87cd9d4f5802c44ea94ee9f357915178654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682F 14528 bytes
font_01_sfnt_off00009696.bin
2697960de0447e60bd1c6df2b59790762c0212a9bb0e5672ed0d81ff18666bec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9696 5236 bytes
font_02_sfnt_off0000a83b.bin
37f71d257c6434e371c4045b647f2aabbf9e0f4e91b2ef268662dd52a2f6c81e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA83B 10604 bytes

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