Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b4c1fad29455ec…

MALICIOUS

PDF

43.9 KB Created: 2020-08-11 05:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e626abf1b486b9b81e0897b341a2574 SHA-1: d2f395c480e83693d3af7e51e5a44fb2cee9a119 SHA-256: 11b4c1fad29455ec7660f9784dffb9d1945e68b32949e7d61f016f24d682a031
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be part of an SEO poisoning or link farm tactic. The ML classifier strongly indicated maliciousness, supporting the presence of malicious content.

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=african+map+pdf
    • http://files.stdavidssociety.org/uploads/1/3/2/3/132303019/6694979.pdf
    • http://rezofet.hotelsformeetings.com/uploads/1/3/1/8/131872225/c45b8.pdf
    • http://jatuforom.archerfield.services/uploads/1/3/0/8/130873822/firifumudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0081/5006/files/aaron_sanchez_fangraphs.pdf
    • https://cdn.shopify.com/s/files/1/0435/0184/6688/files/glock_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7148/8668/files/zifekovigafetit.pdf
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/pigukuzovukog.pdf
    • https://cdn.shopify.com/s/files/1/0432/6726/0576/files/avast_removal_tool.pdf
    • https://cdn.shopify.com/s/files/1/0433/0966/2366/files/84981929781.pdf
    • https://cdn.shopify.com/s/files/1/0434/0337/8839/files/fosofonuwokimar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/77851023816.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1048/files/clicker_heroes_redeem_code.pdf
    • https://cdn.shopify.com/s/files/1/0437/0720/3739/files/pewuvovi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54344474436.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/35239156413.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/pfms_registration_form.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_off00006d23.bin
f5c52ad1b631351350f23376b644f64e3562aef5d7e2fe1c312701163d9e82cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D23 5080 bytes
font_01_sfnt_off00007e44.bin
7942ea32d9f7d83ac1d39bc39885bfb4ef38a75b7dc42cc6f2451d7d5f0c9204
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E44 10764 bytes