Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f788f58464d12b…

MALICIOUS

PDF

36.4 KB Created: 2020-08-14 22:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1908bc14877c764b51a016aeaa1a8fc SHA-1: a543d73879db3528378a853a42e491638918eb25 SHA-256: 61f788f58464d12b94420ca620962ff257346589121e3bc7f1071ed989fcd105
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and a critical heuristic firing indicates it links to known malicious redirector infrastructure. The ML classifier strongly suggests maliciousness. The document body contains obfuscated text and URLs, including the primary redirector, indicating an attempt to drive traffic 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.com/pify?keyword=cempaka+kuning+pdf
    • http://files.vintagerhythmandbluesensemble.com/uploads/1/3/1/3/131384674/zoturolelek_niduramu_liwesete.pdf
    • http://files.bayareaentertainer.com/uploads/1/3/1/3/131383383/779231.pdf
    • http://files.terrencejon.com/uploads/1/3/2/6/132682833/1418911.pdf
    • http://files.londontoursatnight.co.uk/uploads/1/3/2/7/132740501/1f21781da57f.pdf
    • http://files.hogsandairdogs.com/uploads/1/3/2/7/132740467/a17557e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3862/9275/files/kitupamevadus.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/49657801818.pdf
    • https://cdn.shopify.com/s/files/1/0430/3234/6773/files/carer_allowance_form_australia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/mejewipoxuwanexive.pdf
    • https://cdn.shopify.com/s/files/1/0440/6345/7432/files/87756335427.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4696/files/english_word_stress_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/copy_string_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/7482/9987/files/89912973612.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7808/files/zatofogedepugevapi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/pojakoruz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0428/6382/0959/files/89836732032.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_off0000525a.bin
5f90b35d722648dc7011ac6b605b6ecdaef5009312b503c040f4ba4a7304259b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x525A 5024 bytes
font_01_sfnt_off0000636a.bin
3743cfa29ddf864365e593d70c28e1cd663838dacc14ba1d841fc3e83141b852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636A 9856 bytes

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