Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3358bac18eafdac…

MALICIOUS

PDF

40.9 KB Created: 2020-08-17 04:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 280930eeb6463c70c02fa96d8ff7a509 SHA-1: 4acadea9915b0bb75abb66f18524342355cb76a3 SHA-256: b3358bac18eafdac56ef3664a9d5957a2df63a7a4524de90c3851c629cf9f446
154 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, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'Anti theft alarm pro app' and the malicious URL, suggesting a lure to trick users into clicking. The ML classifier strongly indicated maliciousness, and the PDF structure itself is designed to host a large number of links, likely for SEO manipulation or to distribute malware through a link farm. No scripts were extracted from this sample.

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=anti+theft+alarm+pro+app
    • http://files.honsinternational.com/uploads/1/3/2/7/132740606/2021438.pdf
    • http://zisib.ianwarder.com/uploads/1/3/2/8/132814930/rotipugewux.pdf
    • http://files.smallgroupsministry.com/uploads/1/3/1/8/131858916/4fc8e7ab.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/rectangle_formula.pdf
    • https://cdn.shopify.com/s/files/1/0433/0831/8878/files/lolosonise.pdf
    • https://cdn.shopify.com/s/files/1/0447/9637/9285/files/brownie_household_elf_badge.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/vodur.pdf
    • https://cdn.shopify.com/s/files/1/0440/5228/3542/files/73221176755.pdf
    • https://cdn.shopify.com/s/files/1/0439/4339/5483/files/argala_stotram_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3110/1603/files/tuwel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78394199391.pdf
    • https://cdn.shopify.com/s/files/1/0434/4266/7676/files/53648714406.pdf
    • https://cdn.shopify.com/s/files/1/0430/8818/3456/files/52107413768.pdf
    • https://cdn.shopify.com/s/files/1/0460/1407/0945/files/brotherhood_of_steel_uniform_black.pdf
    • https://cdn.shopify.com/s/files/1/0437/1732/9064/files/febosaguvixikunep.pdf
    • https://cdn.shopify.com/s/files/1/0436/0699/9203/files/medical_summary_report.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/kevewonuxezivasolagesi.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_off000062fd.bin
62f2dd75d7df168b8e423f5a099a4b4ac328645349d02738b9d8b778c2d94b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FD 4952 bytes
font_01_sfnt_off000073a6.bin
3a426afbdec5f9087c006c349f8d48d1fa1d3c7dd93b60f9cab2a864f19fd7e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A6 10308 bytes

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