Malicious PDF — malware analysis report

Static analysis result for SHA-256 688161c1f7f433a9…

MALICIOUS

PDF

42.4 KB Created: 2020-08-19 00:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0a48ad372ff3395ac4dc8d2d20a29df SHA-1: b8630b8c2ee5680f9f51c96718841c5ea99a59d8 SHA-256: 688161c1f7f433a96183be12f0ce8f00fad3f00ab9582e12c2ad992bfca61cbe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=add+header+row+to+excel+sheet'. The document body, though partially obfuscated, also contains this URL and references to other PDF files hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=add+header+row+to+excel+sheet
    • http://files.tamaralow.com/uploads/1/3/0/8/130814861/dunopulakigi_gudupa_duragarevi.pdf
    • http://files.fandrlive.com/uploads/1/3/0/7/130775858/450736.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7165/8392/files/mirokajojatoxek.pdf
    • https://cdn.shopify.com/s/files/1/0440/8662/4406/files/59163239426.pdf
    • https://cdn.shopify.com/s/files/1/0448/4779/2288/files/asia_cup_2020_schedule_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/6067/2165/files/mibodomamewufutusi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/29919250451.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/advanced_d_d_monster_manual_1977.pdf
    • https://cdn.shopify.com/s/files/1/0433/8755/1893/files/adder_tv_shows.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/63212793166.pdf
    • https://cdn.shopify.com/s/files/1/0437/3934/9146/files/6779642544.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/nosasenojenobiperorixo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0117/files/rimepubatulimajufunafije.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/bosquejo_del_libro_de_romanos.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/27781320637.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067f0.bin
1ec7c07a62c613f3111dbadcd54ede82cc98f5ab78c003e0069559d424feeccf
pdf-font-stream PDF embedded font (sfnt) at offset 0x67F0 5176 bytes
font_01_sfnt_off00007996.bin
10c103c3c7c151b4ecc7101905af2bbcf53e91e9380e6bc490aa5c5161d7ef22
pdf-font-stream PDF embedded font (sfnt) at offset 0x7996 10284 bytes