Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a9003eef7a4694…

MALICIOUS

PDF

49.9 KB Created: 2020-08-06 06:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d476cc3c19bfe7935948fd8df9810031 SHA-1: b267161a001dbf016756c25541ad1d90e6b77edf SHA-256: 13a9003eef7a4694e5d8c831381aa38bdc14714ecdc198e1c56692982afc5228
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text suggesting a lure related to creating algorithms, and includes the malicious URL. The presence of numerous links, many pointing to Shopify domains but likely part of a link farm, indicates an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=comment+cr%25C3%25A9er+un+algorithme+informatique+pdf
    • http://files.brijuni.studio/uploads/1/3/0/7/130738548/a51539.pdf
    • http://files.finksdeli.org/uploads/1/3/2/7/132741222/5b0259.pdf
    • http://files.theilounge.net/uploads/1/3/0/9/130969056/palikovu.pdf
    • http://fulibu.savetherockcreekparkdeer.com/uploads/1/3/0/7/130776262/lexaxufokaza-gezofifulew-tigivivorifutoj-berujovofake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5833/9733/files/22939911012.pdf
    • https://cdn.shopify.com/s/files/1/0428/0690/2950/files/25943683979.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/26016845054.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3399/files/54610753946.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2325/files/adventures_of_sherlock_holmes_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/augustana_boston_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/1035/8423/files/89500547040.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/jojarap.pdf
    • https://cdn.shopify.com/s/files/1/0428/6890/0006/files/90151999542.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2703/files/how_to_make_bullet_points_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5387/files/83767251219.pdf
    • https://cdn.shopify.com/s/files/1/0428/5533/4055/files/nafepevawofekakowepub.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_off0000776e.bin
7bc0a76c71ddaa1901f9bd65a2784bd91990397eafb8bb92c47daca7f24535ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776E 5564 bytes
font_01_sfnt_off000089d3.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D3 1800 bytes
font_02_sfnt_off00009260.bin
5137ec84ca27ecf18a105e2c0f7b7815c213aae1528d1939c1368a0c654a03d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9260 11928 bytes

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