Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9f4ff5afba37a3…

MALICIOUS

PDF

37.0 KB Created: 2020-09-01 13:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6f9d793cdbb1db351638a7a38c8c3b1 SHA-1: a0df6c78e4f8063aea0d60a316326106002d3716 SHA-256: dc9f4ff5afba37a3ca66cdbf923deae6f5ec6d4899dde35181d2d1c388cd1355
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL. This suggests the primary intent is to redirect the user to malicious infrastructure, likely for further exploitation or phishing. 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/wix?keyword=commando+2+movie++tamilyogi
    • https://cdn.shopify.com/s/files/1/0432/5353/0782/files/ableton_live_10_reference_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5750/4668/files/sisademawubitiwiwilawi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/sigizimozibamagazilezut.pdf
    • https://cdn.shopify.com/s/files/1/0436/6693/1862/files/remorapanajijofe.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/bawiwolun.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3820/files/free_personal_loan_agreement_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1437/files/welcher_ebook_reader_fr.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5340/files/84420889738.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/xumotubuwewokuluri.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/dizagupidipuliwumuwafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1375/9395/files/39228361650.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3259/files/gufixusijomowupipubuzewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokesinoximirupabujikupoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/0920/2597/files/nanijuzekazugul.pdf
    • https://static.usrfiles.com/ugd/ae059d_e30f81df89604b379c1380397956f0ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_785771358b144249a8f55fa1d806eb23.pdf
    • https://static.usrfiles.com/ugd/5b9a87_78f4e0c0b3b54c1f8c8cc0c5bcb1f8c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c3396a730224ef3be5a2a9c5f2265b8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005250.bin
23b545e75698860737b4037a93964ff4834dc1a8ed4a07857613cbf6cdb67b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5250 5068 bytes
font_01_sfnt_off0000638b.bin
b06bf295dda33f6fec702ccc8416a98a16730114907ba6cd6659a6b076fde2a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638B 10476 bytes

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