Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b5ccb78139010a…

MALICIOUS

PDF

46.7 KB Created: 2020-08-03 15:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d3fc91cb930efc68b1c967f85226ad5 SHA-1: 9a737d26be21861183e6c53aa37a7b02175249db SHA-256: 74b5ccb78139010abbea3b6e9824daaa3d3a959ec2bf3faf94b72efd024099fb
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests a large number of external links, likely for SEO manipulation or to host further malicious content. The embedded URL 'https://ttraff.cc/pify?keyword=epidemiology+and+biostatistics+pdf' is the primary indicator of malicious intent, likely serving as a 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.cc/pify?keyword=epidemiology+and+biostatistics+pdf
    • http://files.darcyclarke.us/uploads/1/3/0/8/130814387/4258394.pdf
    • http://files.oasystec.com/uploads/1/3/2/8/132814024/5386157.pdf
    • http://files.policeaward.com/uploads/1/3/0/7/130775563/tanejotuvalofij_dajijugusapaju_losakasozojozaf_derofaximaba.pdf
    • http://files.ameliakatjohnson.com/uploads/1/3/1/3/131379325/wamijudop_semeto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/fireeye_cyber_threat_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/regoravo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/49998563301.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/pumulutimutobid.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/xuvogutunufub.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/67865861833.pdf
    • https://cdn.shopify.com/s/files/1/0438/2117/0850/files/kameserumolib.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/suxejafimewifikuvuxubobuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/tudamotuxegivoful.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/7476429708.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/dakoda.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9323/files/pomizelawakenazisitajeza.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/chaos_druid_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/rads_error_lol_windows_10.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_off0000779a.bin
b1847029dbc3017592082fa30d8567e104a436ff28a8812dca933c464af17f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779A 5576 bytes
font_01_sfnt_off00008a93.bin
f4e057bb1832c18dc32485d5d12925b35f7e986a65aef60a4255c05b3e95eb19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A93 10252 bytes

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