Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bb0a63e40ec71c…

MALICIOUS

PDF

39.7 KB Created: 2020-08-10 16:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dfc6331a8321001def5688fb084e34d SHA-1: 0c6664ffff4dbf55eefbedd115f35a302a821ee5 SHA-256: 13bb0a63e40ec71c534ee390062d6bc1d9615facd34375d7a8fa58f865da8879
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many pointing to benign Shopify domains, but one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains text that suggests a lure to copy and paste content, aligning with the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. This indicates an attempt to trick the user into executing commands, likely to download and run a secondary payload.

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=statics+and+dynamics+physics+pdf
    • http://files.leoslionsden.com/uploads/1/3/0/7/130738534/5a9a0b.pdf
    • http://files.pcomproperty.com/uploads/1/3/1/3/131383269/denanetozeba_jirigilera_nuworasi_wikowalu.pdf
    • http://files.ukcamperhire.uk/uploads/1/3/0/7/130739883/513520.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9455/7350/files/port_authority_bus_terminal_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/driver_manual_nj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0427/6974/4028/files/26977785868.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/pujonirizomuvivevit.pdf
    • https://cdn.shopify.com/s/files/1/0430/1779/7785/files/definicion_de_agonista_y_antagonista.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/sajonusezik.pdf
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/31362232367.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/tasejozasixubepub.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/61280012538.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85986419962.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_off00005dda.bin
b609913a0ed51468d462224d020da434e0cd910ac4c2698d64fd510a4945532f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDA 5472 bytes
font_01_sfnt_off00007050.bin
83ab4b28f7c4c5e65ca2ce313752e763b816bddc25940913326a6a2a9cf9dd5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7050 9776 bytes

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