Malicious PDF — malware analysis report

Static analysis result for SHA-256 7552395505934126…

MALICIOUS

PDF

38.1 KB Created: 2020-08-21 14:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf57ef69283e5596595d289c00d0262 SHA-1: 38d293da3fecb0c0e8f6ee06e7ae59b133bb681c SHA-256: 7552395505934126827dbb6022d10e2cbb45b82c399efcc631544c001361187a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=duppies+surf+report
    • http://divok.bsajhmi.org/uploads/1/3/2/3/132303219/685796.pdf
    • http://zopeza.12utct.com/uploads/1/3/1/4/131453134/69f68c.pdf
    • http://tagotira.royaloaktitans.org/uploads/1/3/1/0/131070827/lawilunuzel.pdf
    • http://bapodoxim.wildcarrotcatering.com/uploads/1/3/1/3/131398455/kilasuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/android_sqlite_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/xigigowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zurutadodusabexefiba.pdf
    • https://cdn.shopify.com/s/files/1/0436/0034/7299/files/x86_assembly_language_and_c_fundamentals_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/shimano_altus_fd_m310.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9469/files/firozisuxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4965/files/lipids_definition_and_classification.pdf
    • https://cdn.shopify.com/s/files/1/0437/2617/6407/files/68444665206.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7174/files/demuduximajomorali.pdf
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/99240367705.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/adding_and_subtracting_decimals_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0434/5357/9430/files/1080p_wallpapers_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5757/files/kelozaxi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7751/0055/files/algebra_2_textbook_prentice_hall.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_off0000592d.bin
447575d4de36153e37c854add0e7e0d02cf44cec83baafd5062fe51da7275a6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x592D 4652 bytes
font_01_sfnt_off00006916.bin
f4d794a17d4ad80e779c50699b093fa599ae4b4a15998e97387e1f1fcf0ef788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6916 10196 bytes

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