Malicious PDF — malware analysis report

Static analysis result for SHA-256 7157b20b241bdde3…

MALICIOUS

PDF

49.4 KB Created: 2020-08-06 12:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd6749790b7ac4ea3dbc2f02155f2465 SHA-1: 7e918218e6f1e26a55a36af4d1d7814b5e91a184 SHA-256: 7157b20b241bdde32695bdbaa81429410a34bd967d868b69ea9e26f6459dfc55
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a high number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the presence of numerous external links, including one to a potentially malicious redirector, indicates an attempt to lure users to harmful content or exploit search engine optimization techniques for malicious purposes.

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.ru/pify?keyword=cassandra+clare+the+red+scrolls+of+magic+pdf
    • http://files.wuhshealthinstitute.com/uploads/1/3/1/4/131437254/kedamuwimiposip_rezigudez_pobedemexarol_bolidutenoke.pdf
    • http://files.mgsesl.com/uploads/1/3/2/7/132740327/rafijemixonigupazuto.pdf
    • http://files.pst4y.org/uploads/1/3/0/7/130738814/piwagitasesesuwatug.pdf
    • http://files.broadwaysupplystore.com/uploads/1/3/1/4/131409309/sasafixa-xigopabowi-lumukebevozeko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/4133/9030/files/star_wars_battlefront2_ps2_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0437/7355/8935/files/polycab_power_cable_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/44266412424.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/83624840874.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/81638265983.pdf
    • https://cdn.shopify.com/s/files/1/0437/1084/0981/files/myspace_mp3_grabber.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/aircraft_engineering_principles_2nd_ed.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/26105121094.pdf
    • https://cdn.shopify.com/s/files/1/0430/7828/7513/files/luvevetadilubinojaxalumad.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/kixupuxuxag.pdf
    • https://cdn.shopify.com/s/files/1/0431/7052/9436/files/nejuwavalus.pdf
    • https://cdn.shopify.com/s/files/1/0428/3649/2444/files/megirogifopav.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/kozotibizokufalizalaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5687/files/papujaxajefegebizuvo.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_off00007253.bin
cb899690c922c7905f9a7a0d6354b446e3af30058524b96dc0efdb6031b96cd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7253 5476 bytes
font_01_sfnt_off000084bf.bin
ef065be25f39320a0b7ea558751b964994b579ee4591ec32aa422d81425af8d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84BF 16512 bytes

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