Malicious PDF — malware analysis report

Static analysis result for SHA-256 45646e6e24d5ec81…

MALICIOUS

PDF

48.5 KB Created: 2020-08-14 05:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7efb824b9787559a3b8dcc35b1dd7b3 SHA-1: ece4930751baadfde77bf86334d9868db90d7799 SHA-256: 45646e6e24d5ec819585cf552368020a4a953c61475ff2ed387bf3afb8316191
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=runescape+artisan+workshop+respect+guide'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links hosted on cdn.shopify.com, some of which are confirmed benign but others are unknown. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its malicious intent.

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=runescape+artisan+workshop+respect+guide
    • http://files.moldingminds.org/uploads/1/3/0/7/130775310/vifus_nowabatinu_pifalen_posanurovanur.pdf
    • http://files.laughter-life.com/uploads/1/3/2/8/132816066/7e859a5d4281db1.pdf
    • http://files.patteecanyonoutdoorschool.com/uploads/1/3/1/4/131483337/fe67ea6f7abf1a3.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/biografia_de_averroes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/top_engineering_colleges_in_karnataka_rank_wise.pdf
    • https://cdn.shopify.com/s/files/1/0436/0939/1261/files/mizupasanisuzasadagapugal.pdf
    • https://cdn.shopify.com/s/files/1/0438/1114/3842/files/english_language_comprehension_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81858120772.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2150/files/26990087226.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/jefenizanujodiletifure.pdf
    • https://cdn.shopify.com/s/files/1/0440/5464/2853/files/loxonabaronijikidesun.pdf
    • https://cdn.shopify.com/s/files/1/0446/9224/2588/files/crescendo_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/1341/2760/files/city_branding_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0440/9910/9016/files/kasetorotasigutitujedeti.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/fegumajarajuborovis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7621/files/classification_of_carbohydrates.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007efd.bin
cc6ecc50d01437c6d4dc7ec3e124bc93ee685e713e28a2a15d8d52f61a9d025b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFD 5468 bytes
font_01_sfnt_off0000919f.bin
c53e4c364b7576bbb93674f82b46362a2ec66aa8dc4f062f46db5a5908d0f20f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x919F 10312 bytes

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