Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4280c4d448e6b2…

MALICIOUS

PDF

46.3 KB Created: 2020-08-12 22:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bf07ed7616a4293fe1b347e8aede3a3 SHA-1: 640522cdc3d999feabee977df0b7e366adea8f80 SHA-256: 5d4280c4d448e6b28dd0e5e2857fd4521d9cc360b2681191d9729bcaf83a2766
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link redirects to `https://ttraff.com/pify?keyword=reading+books+for+3rd+grade+pdf`, which is flagged as malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same redirect URL, indicating a deliberate attempt to lead users to potentially harmful content. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=reading+books+for+3rd+grade+pdf
    • http://files.wilmingtoncarenet.org/uploads/1/3/0/8/130814980/9ab052acdda0ba4.pdf
    • http://files.rocklandcountyumpires.com/uploads/1/3/1/3/131379231/a1ea2cb.pdf
    • http://files.lagunabeachkitehouse.com/uploads/1/3/0/7/130740044/2ef465f7468342d.pdf
    • http://files.disastersisters.com/uploads/1/3/0/7/130775320/jesoforuwuxabej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/6016/2713/files/test_de_raven_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0437/4387/1127/files/understanding_business_law.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4470/files/nilinuxinejiwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/nimoka.pdf
    • https://cdn.shopify.com/s/files/1/0432/3026/5511/files/simple_past_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2614/files/popoxaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5046/files/budovoxixobil.pdf
    • https://cdn.shopify.com/s/files/1/0440/3858/6518/files/linux_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/mechanical_engineering_projects_download.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_off00007526.bin
4dfbc4cbae362925f889960c760ae8dc537bad339a70763e666988290be8e0be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7526 5552 bytes
font_01_sfnt_off0000881b.bin
f55f94965bb576578ced42b0e84ee84b7c0a6f6205bb9962866e7ab49d02cf72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881B 10704 bytes

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