Malicious PDF — malware analysis report

Static analysis result for SHA-256 753e514255351cf0…

MALICIOUS

PDF

41.8 KB Created: 2020-08-09 01:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a4bad8d9d2ecbfb3685b661bc395d8b SHA-1: 1633f3bca33472830289caedb983b0362e6e7f9b SHA-256: 753e514255351cf02041261a42605781ad2b5c6f0b8ef9c77b421da2b8756af9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator.

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=algorithms+book+sedgewick+pdf
    • http://lumele.plbra.org/uploads/1/3/0/7/130776542/696317fbeec5b7b.pdf
    • http://files.aepministry.org/uploads/1/3/2/3/132302963/lupinorofox-towezano.pdf
    • http://mekajej.sheetalajmani.com/uploads/1/3/0/8/130814328/kepapum.pdf
    • http://kunexato.claudiafreepoint.com/uploads/1/3/1/4/131437812/ronerinemosinu.pdf
    • http://files.puzzlesandbraingames.com/uploads/1/3/1/6/131607027/wibamalozenanile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0443/6390/files/10419364479.pdf
    • https://cdn.shopify.com/s/files/1/0429/2886/5446/files/17686426322.pdf
    • https://cdn.shopify.com/s/files/1/0434/6609/6806/files/93614196431.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/bandiera_italiana_da_colorare.pdf
    • https://cdn.shopify.com/s/files/1/0441/0979/1384/files/telugu_calendar_2020_october.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0579/files/carlsbad_caverns_national_park_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4573/files/autumn_leaves_trumpet_solo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6579/2929/files/xovovuxupelojiwazesidozag.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6973/files/89798413549.pdf
    • https://cdn.shopify.com/s/files/1/0433/4403/5993/files/three_billy_goats_gruff_story.pdf
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/minecraft_cookie_recipe.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_off000064e8.bin
7c60e3d20d2f7d894b18cfc2798dd301c2c9735852c6145fedcaee051702151e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 5644 bytes
font_01_sfnt_off00007807.bin
1a80256b83ee3289481705ecfb74968294c3b3d4187151f37b387022bfcf5fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7807 10004 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.