Malicious PDF — malware analysis report

Static analysis result for SHA-256 08dc9c8c160632fc…

MALICIOUS

PDF

41.1 KB Created: 2020-08-12 10:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b5482abe6f7f136ae447a6ebb36d37b SHA-1: 617addcea42599d497efc99375be988b66f0631d SHA-256: 08dc9c8c160632fcbddd2a9065d6b81021a3a1e36b194827efee31f8bb91edad
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body itself is heavily obfuscated but contains references to the redirector URL and other benign-looking Shopify URLs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of malicious intent.

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=agricultural+and+biosystems+engineering+pdf
    • http://files.shivagallery.ca/uploads/1/3/1/3/131383255/gefos-ragimesikif-nenow.pdf
    • http://files.antens.nl/uploads/1/3/1/8/131856706/c4e3c161fb7.pdf
    • http://files.orientalcollectables.com/uploads/1/3/1/6/131606491/kanamitasifaf_nuridalelifar_zunurusujonogew_lokot.pdf
    • http://gavisaf.madmaxjerky.com/uploads/1/3/1/3/131380600/jabetajokiwefa.pdf
    • http://lomapufo.shineworksdetailing.com/uploads/1/3/0/8/130874429/5945360.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/xixabevimivi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/soccer_referee_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0447/3896/9749/files/bukidoxolijozejejikupum.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/40149924655.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pijajaza.pdf
    • https://cdn.shopify.com/s/files/1/0434/6377/0272/files/naxagununikafududapada.pdf
    • https://cdn.shopify.com/s/files/1/0431/2694/8001/files/ecosystems_theory_in_social_work.pdf
    • https://cdn.shopify.com/s/files/1/0440/0467/1646/files/guxevivafonakofo.pdf
    • https://cdn.shopify.com/s/files/1/0452/7934/6850/files/anomalias_dentarias_de_posicion.pdf
    • https://cdn.shopify.com/s/files/1/0432/4265/1805/files/482222711.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/71820602331.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_off00006048.bin
e767086e326bda717a07c1c4aedd29c859224394e4c7faffdde50e683063db15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6048 5708 bytes
font_01_sfnt_off0000739d.bin
b4b4e05268bcd2fedc094c03c8bcf2aa7bdc5a7628767d4d855d8bebb61ecff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739D 10484 bytes

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