Malicious PDF — malware analysis report

Static analysis result for SHA-256 b522139cdf036ce2…

MALICIOUS

PDF

46.6 KB Created: 2020-08-07 20:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e44e6e425d5b583a26287329e4eb3d58 SHA-1: a1df60cf42cc89e1176b3e10547b608afa3a3991 SHA-256: b522139cdf036ce2f81aa35933ec5a7aebf7b2132580b29efbb19ac3b6680f4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a malicious redirector link, and another flagged a link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through a seemingly innocuous document to click on these links, which likely lead to malicious sites for phishing or malware delivery.

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.cc/pify?keyword=frise+chronologique+de+l+histoire+pdf
    • http://files.smoochespooches.co.uk/uploads/1/3/2/7/132741334/1723023.pdf
    • http://files.alumedica.net/uploads/1/3/1/1/131164052/datixiwarokog.pdf
    • http://files.edgrasso.com/uploads/1/3/0/8/130874030/vajekerogunepifopaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0057/files/kojoputejidufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/naxesijomiluzefegewigoter.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/simegajetabipekopevudu.pdf
    • https://cdn.shopify.com/s/files/1/0450/4154/9462/files/ashrae_handbook_of_heating_ventilating_and_air_conditioner_applications.pdf
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/guvejifolugipevojij.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/brocade_network_advisor_san_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/samavoxalola.pdf
    • https://cdn.shopify.com/s/files/1/0434/9621/0594/files/78856012416.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/tuvikajijozujidi.pdf
    • https://cdn.shopify.com/s/files/1/0438/7900/6376/files/19778698012.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5522/files/retail_store_operations_manual.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_off0000668f.bin
a573d6154ee6099f7b296b0475924e0ac4454d25e40e13d09a21f6292dd5fe10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668F 5168 bytes
font_01_sfnt_off00007817.bin
62a020c85d86309b91a03c2213ee07bce1eb693b289641986ec102eed4333c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7817 11888 bytes
font_02_sfnt_off00009db9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB9 4324 bytes

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