Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e78c822c7f8f96…

MALICIOUS

PDF

42.5 KB Created: 2020-08-24 04:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ca31272fe8c9348d4cddbeab9be8830 SHA-1: cd331006d888d53e7ac0c2f9a9e55c9aefae9c8b SHA-256: d1e78c822c7f8f96c0124699a7d95254f07d12a3993845b6cd8ec455c6201d73
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a mass external link farm, with one link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves tricking users into clicking malicious links within the document.

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.cc/pify?keyword=panasonic+bread+maker+recipes+manual
    • http://files.carolinegoldbergigra.com/uploads/1/3/2/3/132303270/660d854892c918.pdf
    • http://files.bionaturae.com/uploads/1/3/1/3/131398334/nujopef.pdf
    • https://cdn.shopify.com/s/files/1/0460/2249/2319/files/user_acceptance_testing_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/3969/4741/files/36017664128.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1528/files/vaxavolig.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/arquitectura_de_computadoras_morris_mano.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/9584231254.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/90385105852.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1162/files/captivity_of_negativity.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51507598499.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/tusebegalodumajis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8126/9401/files/free_excel_2020_calendar_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/tamil_movies_telugu_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/ciencias_naturales_sexto_grado.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050c2.bin
79585563766173c5374a0195968ddf231c8773d937be7ebd5555ead2f787567c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50C2 2456 bytes
font_01_sfnt_off00005ba2.bin
031b133e727ffb680ecd3d48102366d69892240ebe8a24797304d7ee305fee63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA2 5228 bytes
font_02_sfnt_off00006d32.bin
0577129dc18e42501fd120929255cf933993d0a0f741d2b80bf67334aa17ba26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D32 9816 bytes
font_03_sfnt_off00008ec8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC8 4324 bytes

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