Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7a418024b51ab8…

MALICIOUS

PDF

34.9 KB Created: 2020-08-12 23:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e5fe79810f0bc8abd197e534a81b9aa SHA-1: eabb8b57a32480699ee0edc7a3c32d467c328230 SHA-256: 2d7a418024b51ab8d8d0fbd92456271c0cd8194f47da524194a7edfa0c4383e7
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though partially obfuscated, includes the same URL and a product description, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, further supports the idea of a link farm or redirection scheme. No scripts were extracted, but the ML classifier strongly flagged this PDF as malicious.

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.cc/wb?keyword=manual%20drinking%20water%20pump%20for%2020%20ltr%20bottle
    • http://files.smworks.org/uploads/1/3/2/6/132681771/7616c8aefa8.pdf
    • http://files.happyfengshui.org/uploads/1/3/1/3/131379939/banibutimete.pdf
    • http://dorupafob.affordablebarndoors.com/uploads/1/3/1/6/131606289/4e6007.pdf
    • https://cdn.shopify.com/s/files/1/0433/5216/2462/files/gurezarovamazax.pdf
    • https://cdn.shopify.com/s/files/1/0436/8538/0246/files/fakawinuwiwujevi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3208/files/kijezegirelamujuxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1347/1384/files/99396268314.pdf
    • https://cdn.shopify.com/s/files/1/0429/4469/2383/files/xogojesikebiteboxafefive.pdf
    • https://cdn.shopify.com/s/files/1/0428/2286/0956/files/xewupimexamijaweb.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/pabejoveximazuvufi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0094/7103/files/49911293196.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/roxigapavovijutureloso.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/verb_to_be_vs_simple_present_exercises.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_off00004658.bin
d01e80b20a5ce7c4aac3ff1bfc25f823d3513b8ff5cb320cc4b7321a5731c1ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x4658 5756 bytes
font_01_sfnt_off000059f4.bin
2cb4665d4edf8ba91f6ec7d3ccc36bf687cc6fee4fee2d7c5a3dca683dfb1c1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x59F4 10368 bytes