Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac11a4c8fc602db…

MALICIOUS

PDF

64.5 KB Created: 2020-08-30 18:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37ced29d1473735341bb8044cb9f82bb SHA-1: f58ae0f4b63ca9ec24a77a1ea037195c72e8742a SHA-256: 8ac11a4c8fc602db048c691c33cb2aa9d2f6a489dc4e5760bb2ec3789b13c99f
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=funny+tts+lines+discord'. Another critical heuristic identified a PDF link farm, with the first URL being 'https://static.usrfiles.com/ugd/b8c837_344c2116375244afbd20eac82e2cce46.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains these URLs, suggesting a lure to external malicious content.

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=funny+tts+lines+discord
    • https://static.usrfiles.com/ugd/b8c837_344c2116375244afbd20eac82e2cce46.pdf
    • https://static.usrfiles.com/ugd/0aab01_aac5ba795f9642039d0ffb98db9fddfa.pdf
    • https://static.usrfiles.com/ugd/b8c837_5109253166b049b291c4531faa663632.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_80bfad5b17bc4896945acca423d5a083.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e529965e6e147beb781697430368693.pdf
    • https://cdn.shopify.com/s/files/1/0432/7132/3808/files/caprice_carcassi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/90335245234.pdf
    • https://cdn.shopify.com/s/files/1/0463/0645/9808/files/architecture_101.pdf
    • https://static.usrfiles.com/ugd/b11f6d_894e56b003ef48959ff4a58eee11670e.pdf
    • https://static.usrfiles.com/ugd/c83fdb_75cb0f43539e41a79cd7c5af51a54139.pdf
    • https://static.usrfiles.com/ugd/b8c837_f63fa5da256941cfae0d6e715e33bf67.pdf
    • https://static.usrfiles.com/ugd/5b9365_a5fd171dfa4b4c4282560a918c7004d2.pdf
    • https://cdn.shopify.com/s/files/1/0465/0034/8056/files/palladium_rpg_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/radofoduzemegumagulipuxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6412/3814/files/71987072961.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/56134590920.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/6937491775.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088d4.bin
91901b2da138e7f57706a98d0d3e9c124199d6a841c0af16ff43c4e1d7fc1668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D4 2972 bytes
font_01_sfnt_off00009353.bin
8351fdf08d1a9aa7d10c87f5120c360c833e1a22b5ad252cf4f946b769bff39c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9353 4780 bytes
font_02_sfnt_off0000a3a0.bin
9e05b5318e0caa7402a0c253e02e3ec237a9cd60fcb4cacf7d0c153b20043fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A0 2112 bytes
font_03_sfnt_off0000ad72.bin
d9721a6787f02ffce3044899ade8fad8dfa348747ba3bdb13bafe0cef0d1d136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD72 15036 bytes
font_04_sfnt_off0000dc4b.bin
e38c1bf64764582757dc05d17ab2e5b5758b22ee08700b9db35351ba74d249e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 16332 bytes

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