Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef28bc947f1a3faa…

MALICIOUS

PDF

37.8 KB Created: 2020-08-04 10:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8795b9b8bdcb7ad51105b2d43f2c84e SHA-1: 513018af18ecda28121199f4328c98ef393e8c81 SHA-256: ef28bc947f1a3faafe123dd58b56101dee15e8abfc282754cfbae3975392f763
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'simpolo sanitaryware price list pdf', suggesting a lure to disguise the malicious link. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of 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.ru/pify?keyword=simpolo+sanitaryware+price+list+pdf
    • http://verize.livinginthelight.co/uploads/1/3/2/6/132681513/873371.pdf
    • http://files.mapang.org/uploads/1/3/2/7/132740214/6755786.pdf
    • http://files.mcminnvilleaircraftmodelers.com/uploads/1/3/1/4/131408142/vikotup_duraxebarilup_zujofoxogakem.pdf
    • http://files.lovebugny.com/uploads/1/3/0/9/130969742/jeludogofomasa-nozukaladag-mevudabiw.pdf
    • http://files.downtherabbitholewines.com/uploads/1/3/1/3/131398583/nutojeligip.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/ginufofinavuse.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/givaritapegogenojaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5539/0630/files/34032264352.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/4491800158.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/zonumufanedora.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/64078610523.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/nafilirilibilonetoroli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/10796470905.pdf
    • https://cdn.shopify.com/s/files/1/0432/5012/2916/files/nabaveteletalabidetadugud.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005546.bin
7e484e42e2d7e98cc15fdd6f78e2785fe73cf29847f79fe0d62496564b08cbbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5546 5596 bytes
font_01_sfnt_off0000684b.bin
e9a61c73ce7e86766a2fc471c5a3c2f4b8ec1e9759ee93ee373afb8abde85624
pdf-font-stream PDF embedded font (sfnt) at offset 0x684B 10016 bytes