Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fce09a1d830ae76…

MALICIOUS

PDF

52.9 KB Created: 2020-09-11 09:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cff5146a2215581c1c5db22d2114a8ac SHA-1: 38affcad16eda857ba730c4304d7cb7a0f516ead SHA-256: 8fce09a1d830ae76c8fb42b890d6f76edf5e85de7f87df45f3acf7281abc4312
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a link farm. The document body, though partially obfuscated, contains a URL that is also present in the list of embedded URLs, suggesting a deliberate attempt to direct users to malicious sites.

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.club/wix?keyword=information+about+mexico+food
    • http://gofov.makingeverydaysacred.com/uploads/1/3/1/4/131453453/julajo-tazesi-rizomavilovu-pebewobamabut.pdf
    • http://files.sprucestreetnyc.org/uploads/1/3/2/6/132695620/posasalugudup-mapip.pdf
    • http://pamewewut.bigintimates.com/uploads/1/3/0/7/130775162/tasebexafi-tamonovojifute-monanumabu-takadolipepug.pdf
    • http://files.nashvillebodyworks.com/uploads/1/3/1/4/131408103/4872958.pdf
    • http://kabefif.joshbilickiracing.com/uploads/1/3/2/3/132302780/mozibegi.pdf
    • http://dafag.castlehill-training.com/uploads/1/3/2/8/132814838/6800841.pdf
    • http://bavasu.totsandco.org/uploads/1/3/0/7/130776089/zuwir-gilatewil-sisas-fajid.pdf
    • https://static.usrfiles.com/ugd/33c377_e22f06afda37459caa43ad500bc8f982.pdf
    • https://static.usrfiles.com/ugd/4f270c_ca710ab99694404f9c3a16ca57181fc7.pdf
    • https://cdn.shopify.com/s/files/1/0436/3704/7449/files/220_bus_timetable_cork.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0469/files/52094210449.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/4553122683.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7223/files/debixepur.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0023/files/grasshopper_mower_parts.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008510.bin
9445b19239e8052f91af607e5286c9191a6c81b52106855332c6599ec95f3536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8510 4984 bytes
font_01_sfnt_off000095da.bin
6ca12027206e9f1f871cf1959b8e6d2315cd505c96b7ac3057695bcfddefcaed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95DA 10176 bytes
font_02_sfnt_off0000b881.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB881 4324 bytes

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