Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f57fb76b6b7f276…

MALICIOUS

PDF

49.3 KB Created: 2020-09-01 19:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d15f310abf28dd6aaef49acdc846b803 SHA-1: 95f535aaafff02b8b687171083e25ec3a4316d54 SHA-256: 7f57fb76b6b7f27674e59441edacbf6b731d509e3187e34982057e3dc62a7d91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body explicitly contains the URL 'https://ttraff.link/wix?keyword=chrome+apk+para+pc', which is presented as a download for 'Chrome apk para pc'. This URL is known to lead to malicious infrastructure, indicating a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded links strongly suggest a 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.link/wix?keyword=chrome+apk+para+pc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2602/2554/files/fozarowok.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6901/files/kaxibaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8320/2711/files/sondan_ka_basama_0_dr.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/pokemon_blaze_black_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9209/0784/files/thalia_life_story.pdf
    • https://static.usrfiles.com/ugd/9ea91e_230fd8afc2d249dda65901382615eaa0.pdf
    • https://static.usrfiles.com/ugd/e42ee3_a880b909c58c48c085cfc800da45ff64.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a07ca46983945c9a32d91639ec6db3f.pdf
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/mofojirasinezew.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/adjective_adverb_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6651/3818/files/lipuw.pdf
    • https://cdn.shopify.com/s/files/1/0463/1579/8693/files/nupizuror.pdf
    • https://cdn.shopify.com/s/files/1/0432/8488/9758/files/zipinematixewuti.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/42369731853.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_off00008523.bin
dc6265437f2cf9810f8d8e5bdfdbb9a49f5043a7985d2cf52fad90d925204a7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8523 4932 bytes
font_01_sfnt_off000095bb.bin
85aec5a0f26bbc896052b42736f906cc781bf31a8080fb347ebc872c711d9fb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x95BB 10296 bytes