Malicious PDF — malware analysis report

Static analysis result for SHA-256 838c7d25ac6a3a6b…

MALICIOUS

PDF

40.4 KB Created: 2020-09-06 02:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea2b90e2e306780ccf6f24b74af1b5f3 SHA-1: 1bdab9f20d527659a193ea561ebb7c4b975e64b4 SHA-256: 838c7d25ac6a3a6b917e67bb5a3ccd2588ef31aa15bfb607ac228c1e2e0af575
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. One of these links, 'https://ttraff.club/pify?keyword=noun+adjective+verb+adverb+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The presence of many external links, including benign ones hosted on Shopify, indicates a potential SEO manipulation or content distribution scheme.

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.club/pify?keyword=noun+adjective+verb+adverb+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/debezofuwon.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/33133955422.pdf
    • https://cdn.shopify.com/s/files/1/0446/1517/2259/files/cg_police_model_answer_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/fidarukaropef.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/47469083776.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/74771418189.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/79931992559.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/download_late_registration_zip.pdf
    • https://cdn.shopify.com/s/files/1/0428/4946/8582/files/bazz_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/44258229775.pdf
    • https://static.usrfiles.com/ugd/85d67f_f228b02b827546e3abc93448f8434763.pdf
    • https://static.usrfiles.com/ugd/83e24f_35f2cfc9d42d4190bd3d6e4a5d922b6f.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0209/files/cosmoteer_mods_star_wars.pdf
    • https://cdn.shopify.com/s/files/1/0435/4175/8101/files/binary_search_tree_in_python.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_off0000611c.bin
4cca65ca07dd970ebb94eb1a8fac8712484ca6c2b5f50e885ac2467564548a5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x611C 5184 bytes
font_01_sfnt_off000072de.bin
56b16c223447062fceb3d405f03b60e159b93d672f3f931fe1bf8081abced6da
pdf-font-stream PDF embedded font (sfnt) at offset 0x72DE 10112 bytes