Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1b90a3b2f9e550…

MALICIOUS

PDF

36.4 KB Created: 2020-08-23 04:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec54478c24aa0d7785d93610505ac8cc SHA-1: 086c0363f1a81a72dcd02e69605e336a9adfbedf SHA-256: 8c1b90a3b2f9e5502c46b988813a601c8ab80c7ad85d01b0eac782666f2e570d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=antenna+vtu+notes+pdf'. Additionally, it features a PDF link farm with numerous URLs, many hosted on Shopify, suggesting an attempt to obscure the malicious destination. The ML classifier strongly indicated maliciousness, and the document body, though partially corrupted, contains text related to 'Antenna vtu notes pdf' and the redirector URL, reinforcing the lure.

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=antenna+vtu+notes+pdf
    • http://mokeju.eartharkbotswana.com/uploads/1/3/1/4/131483245/5513673.pdf
    • http://neloxeje.asheleijohnsoncounseling.com/uploads/1/3/1/4/131454731/jagatawotuzofojupum.pdf
    • http://files.visittvillems.org/uploads/1/3/2/7/132741476/fadupetisubed.pdf
    • http://files.fanaticalyankee.com/uploads/1/3/2/7/132740606/b3c19b2ab67.pdf
    • http://gegirezuj.rangebourne-pets.co.uk/uploads/1/3/2/7/132740228/nizabelovefizejubura.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/96023858195.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/84009652438.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5089/files/bixojifisom.pdf
    • https://cdn.shopify.com/s/files/1/0434/7792/6040/files/entourage_season_3_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/atropa_acuminata.pdf
    • https://cdn.shopify.com/s/files/1/0450/0019/6264/files/fafapaditusevu.pdf
    • https://cdn.shopify.com/s/files/1/0451/1848/8741/files/destination_b2_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7936/8858/files/94040844268.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9703/files/spread_spectrum_modulation_in_digital_communication.pdf
    • https://cdn.shopify.com/s/files/1/0439/4975/2478/files/54090254669.pdf
    • https://cdn.shopify.com/s/files/1/0439/5696/1438/files/xokovajivuwowaruzuzu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/tezolizavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/92195118678.pdf
    • https://cdn.shopify.com/s/files/1/0431/0076/6369/files/josilezaj.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_off00005020.bin
573dded0f722799847a3f89f6a505b47ba24cc95b39240160aba0ad18397f6ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5020 4956 bytes
font_01_sfnt_off0000611b.bin
42b9cfbbfa9f90b229e785bfcb5629d61af77ab1e62ab8df1e3fd8a95df0e2ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611B 10516 bytes

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