Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d7ee55981b9ddd…

MALICIOUS

PDF

45.6 KB Created: 2020-08-03 19:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63621455449160a86fee56c75ab0b529 SHA-1: 470ea755576b6cd0498ef180eda061b214c78bcd SHA-256: 17d7ee55981b9ddd1d6ff3f4ebf4e0c0fdc5cac6615769c0ed5ceca102781f65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to a redirector service. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to malicious content. No scripts were extracted, but the document body and heuristics indicate a link farm lure.

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=descriptive+language+worksheets+pdf
    • http://files.theharbourcc.ca/uploads/1/3/1/4/131437680/cbc217.pdf
    • http://files.seanjmnewman.com/uploads/1/3/2/7/132712508/salolumadojilinij.pdf
    • http://xorunepir.tyingtheknotonyourbestdayever.com/uploads/1/3/1/4/131453323/038a2ff852434.pdf
    • http://files.misfitcrusaders.com/uploads/1/3/0/8/130814672/634f8e.pdf
    • http://files.c4leaders.org/uploads/1/3/0/7/130740257/wubonesawikepazis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/31036363907.pdf
    • https://cdn.shopify.com/s/files/1/0436/1699/3440/files/girotuditenosel.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/9653893947.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/32754859533.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/xetuzupawavile.pdf
    • https://cdn.shopify.com/s/files/1/0429/1067/9206/files/34339195753.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8198/files/wawobugisi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/puxazuvexebuvog.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0515/files/76403596568.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2092/files/bose_wave_music_system_iii_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/57322887304.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2154/files/woresojepupu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006598.bin
e0bbd12e28144e00c10ba873858e3e30592bd8ec1a7d9bf2f71309a9e3094be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6598 5516 bytes
font_01_sfnt_off00007867.bin
e910ad918a015344d3b3420f420bcf8b42fbb44919b28733f94d6b27c46a2cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7867 10072 bytes
font_02_sfnt_off00009af6.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF6 4324 bytes

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