Malicious PDF — malware analysis report

Static analysis result for SHA-256 da52abb2844e6387…

MALICIOUS

PDF

48.7 KB Created: 2020-07-20 03:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 300c67d43160da2bf7fa72f919e55342 SHA-1: 4c5183e010cb9c0160f8fafe881253af81d5c227 SHA-256: da52abb2844e6387c08dc184879816726b1d734546ec7553707a2959c4228a67
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, and another noted a large external PDF link farm. These findings suggest the document is designed to lure users into clicking malicious links, likely leading to phishing pages or malware downloads.

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/wb?keyword=bases%20de%20datos%20relacionales%20y%20no%20relacionales%20pdf
    • http://files.sethcarper.com/uploads/1/3/2/6/132695782/3648724.pdf
    • http://files.derbycommunitychurch.com/uploads/1/3/0/8/130874058/nubekuxuxu-fadolamojo-dudaxexokomejez.pdf
    • http://files.syracusehighnoon.com/uploads/1/3/1/8/131856877/gazamewamif.pdf
    • http://files.theworshipcenterbuildingproject.com/uploads/1/3/2/6/132695200/liwomapoxujerag.pdf
    • http://files.volusiaschoolcounselors.org/uploads/1/3/0/7/130775249/ab983a8f0756b.pdf
    • http://files.worldofvirtualfashion.com/uploads/1/3/0/7/130738969/52801776.pdf
    • http://files.paulwrayleeds.com/uploads/1/3/0/7/130738790/6952842.pdf
    • http://files.altitudeluxurytravel.com/uploads/1/3/2/6/132682204/rotejovisoj.pdf
    • http://files.paulwrayleeds.com/uploads/
    • https://desopipo.files.wordpress.com/2020/06/97296965941.pdf
    • https://rasufid.files.wordpress.com/2020/06/80727985291.pdf
    • https://magelibagub.files.wordpress.com/2020/06/68845930865.pdf
    • https://jogapodu.files.wordpress.com/2020/07/gifavugoliroriloj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0806/4677/files/31193036428.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/sidivevavin.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/fokawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwotowomezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/68092770960.pdf
    • https://cdn.shopify.com/s/files/1/0431/5483/3557/files/lisopibop.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cbb.bin
46a95c1f180069964777dcd057e48ce95f8e22f26f42b1e990682f7b25a8ff6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBB 5088 bytes
font_01_sfnt_off00008e14.bin
28ae31aa797d08be9d6fd38af9e96ffa056ee4eebb11e83862b7ac913507da6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E14 11260 bytes

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