Malicious PDF — malware analysis report

Static analysis result for SHA-256 85274dd07730215c…

MALICIOUS

PDF

48.3 KB Created: 2020-08-23 09:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d11a76f54f8813f447f532c61c576c8d SHA-1: 766c5dbb39610868efeb85c8b57db806dc5198ab SHA-256: 85274dd07730215c036a75407c115cf11ba302dd3c9d17082f366c40591a7d6c
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a 'download' button lure further supports a phishing or scam attempt. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to trick the user into navigating to it.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=asleep+minecraft+map+guide
    • http://files.orderibc.com/uploads/1/3/0/7/130775528/maxevarunomofef.pdf
    • http://files.vancouver604.ca/uploads/1/3/1/3/131380759/datemolapofex-fipux-nawoj.pdf
    • http://files.kannoli.net/uploads/1/3/1/6/131607163/lamovepirasilana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9788/2773/files/wesisuxifubexob.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/financial_accounting_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/6457/2569/files/zupoputumupuzogijikiwupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pazutorigixasozesilax.pdf
    • https://cdn.shopify.com/s/files/1/0434/1635/4978/files/fumepawevumixa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6960/2978/files/wibeluwabumupi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/pumirumevoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9046/8245/files/badoo_application_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7333/files/tivamifudopodolepenelo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/canadian_food_safety_information_network_chin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wudusojixidotivage.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_off00007fdb.bin
198f11c4422089ea766804fc40b07b2d4547f30956f4fe1168aa54e19945c234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDB 5464 bytes
font_01_sfnt_off00009250.bin
be742a193a810495aeb6b20b2167b6e55f879e5f1064807572df67da8c203398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9250 10020 bytes

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