Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96490b8866bc7e8…

MALICIOUS

PDF

55.5 KB Created: 2020-08-31 11:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd643e4e3cb2cfc941e0f41317d2fb4f SHA-1: 0e0061affa155069d53f4024cc2441ede779b9ed SHA-256: a96490b8866bc7e89d1454e72df89049afac578a8261a859f2840771d24536c5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to funnel victims to further malicious content. Another critical heuristic indicates a PDF link farm, with many links hosted on cdn.shopify.com, suggesting an attempt to game search engines or distribute malicious files broadly. The document body contains garbled text but includes the URL 'https://ttraff.com/wix?keyword=restaurant+employee+policies', reinforcing the malicious redirector finding.

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/wix?keyword=restaurant+employee+policies
    • https://cdn.shopify.com/s/files/1/0428/6382/0959/files/sewimamemakutepona.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/vojikeboboriran.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9690/files/verilog_register_file.pdf
    • https://cdn.shopify.com/s/files/1/0435/6050/1407/files/around_the_way_girl_a_memoir_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/files/coordination_number.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/fikofejowaki.pdf
    • https://cdn.shopify.com/s/files/1/0463/3110/1345/files/avery_template_5366_for_microsoft_word_2013.pdf
    • https://cdn.shopify.com/s/files/1/0461/9947/2277/files/former_antiques_roadshow_hosts.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4161/files/laryngeal_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0438/5954/2176/files/south_america_continent_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/5593/9733/files/muvewelefis.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/xafirotarebokejotuguvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/motexonelez.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e7e3e65401943a5aa08e868718d254c.pdf
    • https://static.usrfiles.com/ugd/4b68be_4567315181594f068b7d698c279e629c.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_0f96140c7cac41fa8abba506d1399bd6.pdf
    • https://static.usrfiles.com/ugd/b8c837_bebec2d79e4a49c6bd4768229736433d.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/
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009922.bin
20d318168936471f076007cc17b8e3675de2ee1bd3e2aab1ef163dcd8fbbe4fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9922 5188 bytes
font_01_sfnt_off0000aaba.bin
c44cf50efc119f957297c5072a6f3217b13f52514ae356d091834a045f6ea8ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAABA 11204 bytes

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