Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d7dbd684bbad72…

MALICIOUS

PDF

45.1 KB Created: 2020-09-19 04:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d4ea2df0fb88dca8947d5ca13bdf0c SHA-1: 24ca26d6074da4646647581c7595a025f31b27a6 SHA-256: 52d7dbd684bbad72d90ba401fecbd78804e1b02b498fa1d1ee5006f4b3a319b0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'excited spongebob meme' and the URL that triggered the malicious redirector heuristic. This suggests a social engineering lure to direct users to malicious infrastructure. No scripts were extracted, limiting the analysis of direct payload execution.

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.me/wix?keyword=excited+spongebob+meme
    • https://6a7d91f5-2218-4adf-812f-0e985c0be386.filesusr.com/ugd/ee9d3f_912d539264954faaa17d82e2d51a87f3.pdf?index=true
    • https://b4eb4848-ebfc-4767-a4ab-a6080bcf11fd.filesusr.com/ugd/77941b_26dd63a0f4cb47f8bb41bb005cf8f64f.pdf?index=true
    • https://4291106f-1ff2-454e-a6f1-999555309d24.filesusr.com/ugd/1b9faa_bc5ad1fa4f2544648cc5af8355309c0f.pdf?index=true
    • https://9ab6f931-778c-41e8-93cc-f855d317ade2.filesusr.com/ugd/3f1130_a149a5f0ae084b7481f2e0b9212686d9.pdf?index=true
    • https://19679d8c-a3fd-4210-afa0-726c863062ad.filesusr.com/ugd/8b4172_87a3ba2665624d46881baeb28e50658a.pdf?index=true
    • https://f576b5ce-fee2-42da-aeba-e4e9021f06a0.filesusr.com/ugd/bf0735_d818d89707c14627bd79cf3a1054e352.pdf?index=true
    • https://f633266c-97d5-444e-b094-c03de74e256d.filesusr.com/ugd/ebc5f9_30f8addea3bc4e0aa53cd988d4d345b3.pdf?index=true
    • https://e82aa665-eb71-43a6-a370-dfe65f5b683a.filesusr.com/ugd/3d7af5_12774db451914fa9896edc12158dbf98.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0459/2474/5367/files/steven_ross_painter_wiki.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/sefusazetuzolokuv.pdf
    • https://cdn.shopify.com/s/files/1/0465/9429/3925/files/wewifalabolojedesapijepa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6411/4852/files/new_orleans_anthony_davis_injury_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/22558246931.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/59139751124.pdf
    • https://cdn.shopify.com/s/files/1/0441/1876/9816/files/bandeya_ringtone_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0438/5410/2688/files/reflexive_verbs_spanish_worksheet_doc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066e6.bin
120a3986eca10740df7ca77b0424d461d292b05e2d64e6eed358d52303544429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E6 5008 bytes
font_01_sfnt_off000077d4.bin
7de6de49f48e9524ae48a18bc4dd6f81d5152e55381a4b2ebed6dcdf01952972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D4 9872 bytes
font_02_sfnt_off000099ab.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AB 4324 bytes

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