Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12c20787b2820f2…

MALICIOUS

PDF

51.0 KB Created: 2020-08-21 12:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17eed1dd95af251f1ce49378ffc3cf20 SHA-1: 16aa26122a8b2762f40c57372a06e23ea4490176 SHA-256: f12c20787b2820f26a60cb10b2f36d2e19d883b85fd7d45d3e521b163e06cb7e
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=boyce+codd+normal+form+in+dbms'. Additionally, it features a large number of embedded links to other PDFs hosted on cdn.shopify.com, suggesting a link farm or SEO manipulation tactic. The document body itself is heavily obfuscated and contains some of these URLs, but does not provide clear user-facing content beyond technical metadata.

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.ru/pify?keyword=boyce+codd+normal+form+in+dbms
    • http://files.kimrichardsart.com/uploads/1/3/0/7/130776118/ketibajerazexase.pdf
    • http://files.salsaandtea.com/uploads/1/3/2/6/132696506/fusexi-tudedusabujoji-zijiper.pdf
    • http://files.sdra.org/uploads/1/3/0/7/130776166/8645756.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1032/files/remove_brackets_from_excel_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0448/1892/3686/files/el_cine_mexicano_actual.pdf
    • https://cdn.shopify.com/s/files/1/0446/6917/3923/files/stellaris_human_name_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/womoroturafedidarubajesa.pdf
    • https://cdn.shopify.com/s/files/1/0455/3559/2613/files/beehive_class_9_chapter_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/1993/4628/files/puwetodarekobokujipawa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7909/files/mizefituzodopiva.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7238/files/fusizijulimabejasose.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30552771564.pdf
    • https://cdn.shopify.com/s/files/1/0432/2980/6759/files/jepamuli.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_off0000714c.bin
ee2dcb63b97cd61fd41a2397cde68a36dcd3edf6cc018730a5ea17ba8ed8cfb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x714C 5460 bytes
font_01_sfnt_off000083bd.bin
12672efa426a17f8cef46c5fdfc403bb0b2aa0df835fde4bcd0e6428f1d5d898
pdf-font-stream PDF embedded font (sfnt) at offset 0x83BD 11732 bytes
font_02_sfnt_off0000aa0a.bin
219e5e1e4ad9fa058d4117ca79455666a6d8ea411adfac20ab5c0d669d2bb2b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA0A 16204 bytes