Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a73dc4141f782c…

MALICIOUS

PDF

36.3 KB Created: 2020-08-19 06:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 666ce9362682acda1312317c787bc88a SHA-1: bf693168ef61107282a7bfb59931fe871cf9d304 SHA-256: 73a73dc4141f782c5ad4237a5492782391af5e7ec2365f39b412380991a9b5b8
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate resources, but the primary link redirects to known malicious infrastructure. The document body and embedded links suggest a lure to download a PDF, likely leading to a malicious payload or phishing attempt. No scripts were extracted, but the PDF structure and embedded URLs indicate a malicious redirector pattern.

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=biochemistry+book+pdf+for+dmlt
    • http://files.schnursgreenhouse.com/uploads/1/3/1/4/131453648/gutukexav-zigafopaxo-narobetugefesa-joforiwijevuda.pdf
    • http://nidimaw.avex360.com/uploads/1/3/1/3/131384021/keguge-joravolivoxena-nujowivitefot-degilazejozuga.pdf
    • http://files.jgreenartofficial.com/uploads/1/3/1/0/131070450/6b6a0382ce33c05.pdf
    • http://geposeje.ronslater.com/uploads/1/3/0/7/130775971/vagopedaka.pdf
    • http://files.aguadulcehistoryproject.com/uploads/1/3/0/8/130815124/8b6988.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6678/5953/files/81705256925.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/nanavunafifow.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/boss_gt_100_owner_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/2166/2365/files/zisopikef.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/40352191117.pdf
    • https://cdn.shopify.com/s/files/1/0429/0750/0711/files/2006_fuel_consumption_guide_canada.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/30784266960.pdf
    • https://cdn.shopify.com/s/files/1/0432/0493/5835/files/defidago.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/wezuxotakokagoti.pdf
    • https://cdn.shopify.com/s/files/1/0434/6127/9896/files/487650276.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32867625585.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_off0000504a.bin
d494aaa29d10201389ae5ac9a7fb5ab76d64beb9c166d76a19ce31624b21400d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x504A 5540 bytes
font_01_sfnt_off000062fd.bin
9d1c29072b83a12dd20fb2df77839c9c9aeb64f90416f232b4e57060c1fa69e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FD 9704 bytes

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