Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3ee2dc96b1ecd0…

MALICIOUS

PDF

45.5 KB Created: 2020-08-11 06:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cef14b6f69bcbe0ad3291795a651f2f SHA-1: 103511191b705347393646e85fe1f313d9ae4c29 SHA-256: 0a3ee2dc96b1ecd0eda89aa6e9ef858d6b2500d3c1c814390fef27e0421f2455
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm hosted on Shopify, designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=test+on+grammar+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, reinforcing the lure of a 'grammar test' PDF.

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=test+on+grammar+pdf
    • http://files.thedinanschoolofballet.com/uploads/1/3/1/0/131070619/e4442fba70ba0e.pdf
    • http://files.indoorcyclinginstitute.com/uploads/1/3/0/9/130969993/31a12d0.pdf
    • http://files.halswellwigramrugby.com/uploads/1/3/0/7/130775588/8218573.pdf
    • http://piduta.stjohnsmarengo.org/uploads/1/3/1/4/131453574/tojogul_wubav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/66353220189.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/42128434909.pdf
    • https://cdn.shopify.com/s/files/1/0433/9980/7126/files/97670458759.pdf
    • https://cdn.shopify.com/s/files/1/0428/6893/2767/files/chuyn_t_file_thnh_file_nh.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4679/files/characteristics_of_computer_generations.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2903/files/vokufaposuwukemorinitu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5438/9665/files/vovurebifokixububatosazij.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7946/files/67375816323.pdf
    • https://cdn.shopify.com/s/files/1/0428/8918/3398/files/51713218978.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/49211417551.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9701/files/urban_sociology_definition.pdf
    • https://cdn.shopify.com/s/files/1/0427/6885/9303/files/vertical_axis_wind_turbine_design.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_off000073c5.bin
a2df68156bb979d86e34c31fdde160cb51ece242e68a122ee390ee47771fabb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C5 5280 bytes
font_01_sfnt_off000085a1.bin
d7ec92e8b4bddbab393c0fe57c74bdc6342f41cb26fbc053e435347a4fc44fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A1 10432 bytes

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