Malicious PDF — malware analysis report

Static analysis result for SHA-256 9894c8ec6103a51f…

MALICIOUS

PDF

46.6 KB Created: 2020-09-01 02:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6518ca15ce913d343f33e2ee4b61384 SHA-1: b40bd208a6cab3963d10f8362fa495f1ff56369c SHA-256: 9894c8ec6103a51f0caaedf5d02b64868c3fa83d90f008d71688816c7889ae73
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.ru', are associated with malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, suggesting a lure to a malicious site.

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.ru/wix?keyword=bangladeshi+singer+balam+song
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/i_m_shipping_up_to_boston_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/latent_variables_in_psychology_and_the_social_sciences.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/addition_of_decimals_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/voxasikavomenisawuguju.pdf
    • https://cdn.shopify.com/s/files/1/0439/4188/8155/files/11759016361.pdf
    • https://static.usrfiles.com/ugd/b8c837_50a93dda35e746d0bc26c3120bc39298.pdf
    • https://static.usrfiles.com/ugd/20d83a_44d420195dfc4a1d989e28791fb5c848.pdf
    • https://static.usrfiles.com/ugd/9ea91e_1b09ef051572470889428fc43ad34cd0.pdf
    • https://static.usrfiles.com/ugd/353d00_13f79dc786aa4c0480f86ffea0f7da21.pdf
    • https://static.usrfiles.com/ugd/fe83c3_dd4b1ea6b2ba43f8af491909ada4e26e.pdf
    • https://cdn.shopify.com/s/files/1/0437/9413/7249/files/autocad_civil_3d_commands.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4162/files/rinamakabojebajemafi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1089/files/nedoru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006029.bin
2bd660f368e932a887520148cfbd7b21930c32be93c64ff5c04a713e4419883d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6029 5428 bytes
font_01_sfnt_off0000726a.bin
11b5b2c00a47425047c0bd9c91e537861f937556b04488630e7f8cbf22f1a6e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x726A 4100 bytes
font_02_sfnt_off00007f74.bin
7df19cc7c5772cbed70741ab75477a808f2d95c1a2eb2ef107207701e48f4525
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F74 14948 bytes