Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d5ebe6541c695e…

MALICIOUS

PDF

49.6 KB Created: 2020-09-16 20:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010106f78285071e40bd52bf988da275 SHA-1: d847abb8a4659efd0b4a22e1c8c6b45eb5ed1ba1 SHA-256: 78d5ebe6541c695e0a8ad7c618d5d7e6002ac432a2b5386c25a50f4e3e55d92f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and one URL is specifically flagged as a malicious redirector. The document body itself is heavily obfuscated and contains some of the same URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=yuan+ti+pureblood+warlock
    • http://files.totnestrains.com/uploads/1/3/0/7/130775229/1154812.pdf
    • http://viduwixob.offthedirtroad.net/uploads/1/3/1/6/131606615/nezejusu.pdf
    • http://files.dallasclarnette.com/uploads/1/3/2/6/132681824/fcc2fb14362836.pdf
    • http://files.beardsbytes.com/uploads/1/3/0/8/130874541/lofemutorakom-kuxonuxofoka.pdf
    • http://files.athanasios.co/uploads/1/3/0/7/130739747/5e6f198c00491.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f6b2248b-ba04-456b-8337-d138421c2a9a.filesusr.com/ugd/d1c05f_8cb3d7659d424325a2f81d406a11a6b0.pdf?index=true
    • https://5e1f0ed5-9fab-4342-a207-a6cfaf2cbf1a.filesusr.com/ugd/b90ba1_e98115fb821c44b49d06be562f77de56.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0464/6656/4254/files/dreamweaver_software_for_windows.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0663/files/arduino_led_cube_code.pdf
    • https://cdn.shopify.com/s/files/1/0436/0876/8675/files/12877402266.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007820.bin
b843eeb30281a59b9a27855b57984bb1504c7f219fcd1a8b7118f18caa4a8260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7820 5028 bytes
font_01_sfnt_off00008946.bin
622317fd8929f84347bfee02a993504335d935fd39d9a41d5568d328c809ec07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8946 10144 bytes
font_02_sfnt_off0000abfd.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABFD 4324 bytes

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