Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a668acb580abd7…

MALICIOUS

PDF

47.8 KB Created: 2020-08-13 23:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19887cc2a5dc5bc5da973202f5135056 SHA-1: 8078ba36ea13c32cc1eec4a7ff713b58d142d41f SHA-256: d7a668acb580abd73945fc89564491edf9b9f9e4f2bcf06731d7dfd660b2eb88
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=spoken+english+offline+app+free, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and a 'spoken english offline app free' keyword, suggesting a lure for users to click the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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=spoken+english+offline+app+free
    • http://files.savorlifenutrition.com/uploads/1/3/0/7/130775402/muruzavekelewe.pdf
    • http://files.kara-hume.com/uploads/1/3/1/3/131382841/d32249a01b.pdf
    • http://zubera.meredithbuckleycostumecreator.com/uploads/1/3/0/7/130776257/remuniliv_pufuzab.pdf
    • http://files.david-jones-society.org/uploads/1/3/0/8/130814642/dixagululekivex_tekixomixe.pdf
    • http://pavumiba.marleysk9kitchen.com/uploads/1/3/2/7/132712358/1122616.pdf
    • https://cdn.shopify.com/s/files/1/0454/5862/0574/files/bugamaduwozodalovedimu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9878/4422/files/karmakshetra_bengali_paper.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/53335641716.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2245/files/engineering_economy_7th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/3846/5435/files/the_hangover_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/6652/2790/files/75990990491.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/alignment_telescope.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/xaxulesita.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/rimexaxosugix.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/minecraft_xaero_s_minimap.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/xizaworevisokiwusol.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_off00006f9b.bin
a52774802b39b4de2c385e9a6e94a6428df8f0dee0abdbc6af872885881fc3e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9B 5040 bytes
font_01_sfnt_off000080a6.bin
53031d24ccfe216555c86c3aa86902c3fda2fa55542e5c5a754e3a416495a2cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A6 10412 bytes
font_02_sfnt_off0000a431.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA431 4324 bytes

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