Malicious PDF — malware analysis report

Static analysis result for SHA-256 717fe138e2f9de0c…

MALICIOUS

PDF

46.5 KB Created: 2020-08-12 02:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f107c32e335555c27bb9ecc08e151ac SHA-1: 7520307a49a5d12c30290bfe138c82aefc0920e5 SHA-256: 717fe138e2f9de0c9189312e24928efe096b0f7ff4b50918392b0bd86ab2fce7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes the same malicious URL and a large number of other URLs, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be tricking users into clicking the malicious link, likely leading to further compromise.

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=clasificacion+de+las+empresas+y+sus+caracteristicas+pdf
    • http://files.flurryoffun.com/uploads/1/3/1/8/131871416/5044465.pdf
    • http://kosamu.geralynmontano.com/uploads/1/3/1/3/131380600/508cba9ffd0e9a.pdf
    • http://zarezazi.waisolutions.com/uploads/1/3/1/3/131398097/1888499.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5757/8137/files/jozuropija.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/monenevigodajokofi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9835/6392/files/turevoxegugosupavepinexid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdf
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/90059460684.pdf
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/jawiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6655/files/advanced_stroke_life_support.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/kuputaxunikuxovafeli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ketotojugidumirazi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/bitcoin_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/fefidasekufo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7436/files/89636391265.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_off000075e7.bin
91b825bf911c98f7b457d1baca2127e57e43cbc0f375afbb64280d29ff217416
pdf-font-stream PDF embedded font (sfnt) at offset 0x75E7 5308 bytes
font_01_sfnt_off000087df.bin
7b1e111c097f109d1ddc9868e6b7ecc550d3a7559c34cd45fc04eeb4ee0b51c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x87DF 10688 bytes