Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f8b758b549fc6f…

MALICIOUS

PDF

53.7 KB Created: 2020-08-14 19:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d6387d2d62e6ebf660ed4010bc17fd6 SHA-1: f51231c67cbaf81495bf0d04f00318c800f19b70 SHA-256: e5f8b758b549fc6ffc06d953a38ab09df936fce7fdde7704fffeedc768bd296b
152 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, a common tactic for SEO link farms and phishing lures. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc). The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to harmful sites.

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=steven%20millhauser%20short%20stories%20pdf
    • http://files.theprefabsproutproject.com/uploads/1/3/1/3/131397946/xolizipobepezu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/bokaxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/jumikujotenorolorazo.pdf
    • https://cdn.shopify.com/s/files/1/0448/2547/7277/files/al_quran_16_lines_tajweedi._download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7364/files/banino.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/3d_plot_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/51371780659.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/wivoduwoxedixijefetitowuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/charcoal_drawing_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5312/files/67327060652.pdf
    • https://cdn.shopify.com/s/files/1/0431/8717/5588/files/42113100516.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1413/files/sajesukuwewa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8427/4081/files/kusodekadeguzojoriwibam.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/34189795478.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_off000094d2.bin
c067d47b32c0ee364f02694083ab246f1e4d82dca27ec0c2e6f43020c4c23e1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x94D2 5444 bytes
font_01_sfnt_off0000a727.bin
1c7abc7edd28dfa88921946775a0c6c7b775d51e0d5057ace19860612c62ff28
pdf-font-stream PDF embedded font (sfnt) at offset 0xA727 10260 bytes