Malicious PDF — malware analysis report

Static analysis result for SHA-256 224955e4077b43d2…

MALICIOUS

PDF

45.4 KB Created: 2020-08-29 22:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d59c48bab0daff010aaab92a519f226b SHA-1: 691d0de9eb87b0503a5caef7628c30973c1c2797 SHA-256: 224955e4077b43d214e382035c86d11a51c4288d65467b841e8b0d840c17dbd2
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains a high number of external links, indicative of a link farm. One of these links, 'https://ttraff.me/wix?keyword=aa+big+book+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure.

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.me/wix?keyword=aa+big+book+pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/4553001334.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/denemukuxolosug.pdf
    • https://cdn.shopify.com/s/files/1/0433/2011/5358/files/zumok.pdf
    • https://cdn.shopify.com/s/files/1/0447/5063/5162/files/video_downloadhelper_firefox.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ae687dded894163a8793a6b9aac9a69.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_ba817946b7f442ecb089ef60036aa5c7.pdf
    • https://cdn.shopify.com/s/files/1/0432/8777/3342/files/sukuzaxabonemivumixan.pdf
    • https://cdn.shopify.com/s/files/1/0436/3884/9694/files/radada.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/tagagaxileluxuvogesetulan.pdf
    • https://cdn.shopify.com/s/files/1/0439/4621/3544/files/menijo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/transformer_voltage_vector_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7755/files/79513267599.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007238.bin
02079fecf48f106b8583df9c155f6b43ff18fe263b7479d70736fd8e8a0f69d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7238 5096 bytes
font_01_sfnt_off000083a4.bin
5a3e7d178627dbd5655a4bd7780c8f0ffe57c237ff426d2c3d0ce913219937bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A4 10924 bytes

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