Malicious PDF — malware analysis report

Static analysis result for SHA-256 681f0f19996c9c30…

MALICIOUS

PDF

62.8 KB Created: 2020-08-30 22:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c5499e8cab9ebd8a7ab2d5349cb7af1 SHA-1: 6d133919cd508e9a90799708af3d2eba929bac17 SHA-256: 681f0f19996c9c30eea52fa67d3ce194c7154ddb28ed3adb4e2201188949b975
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links. The document body, though heavily obfuscated, also contains the malicious redirector URL and several benign Shopify URLs. The presence of a malicious redirector suggests a phishing or scam attempt, likely aiming to deliver a secondary payload or lead the user to a fraudulent site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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=the+complete+guide+to+option+selling
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5630/7107/files/nekumupoderanazatazi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9927/3882/files/java_lang_null_pointer_exception_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/fibonacci_sequence_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/54273916129.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/fosobas.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/cardioversion_electrica.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/48810312598.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/muxalonowoxuvumofuv.pdf
    • https://static.usrfiles.com/ugd/1813b3_d6252bf5cd924faba93d8ff58d41bb91.pdf
    • https://static.usrfiles.com/ugd/1f6d71_40ea39dcde71449e9d2f43e8adc9c4a9.pdf
    • https://static.usrfiles.com/ugd/e3834b_c256e4faa626470f97fef653e7d08c47.pdf
    • https://static.usrfiles.com/ugd/e4ff69_0f847a5454a04461b3f309dcfd9ea636.pdf
    • https://static.usrfiles.com/ugd/7598fa_9cb8814bc15d4e949be33a13bbc1c493.pdf
    • https://static.usrfiles.com/ugd/b8c837_78b162e72da3437086b193559b6a6bf9.pdf
    • https://static.usrfiles.com/ugd/225520_3fd6ab8c880d4b59b57c11ccbc881508.pdf
    • https://static.usrfiles.com/ugd/b8c837_fff7a2b6cdc04b4a86919b16fa7089a6.pdf
    • https://static.usrfiles.com/ugd/e8506d_a10345310f744a0c9a3e6b1535b7550b.pdf
    • https://static.usrfiles.com/ugd/b8c837_157440d2edae43d6b7bdffdd7c5d561d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acfb.bin
d6ecf6b5cced37d486d3791e9e18e83c1f6c568070740b51461de9c91059f091		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACFB 5132 bytes
font_01_sfnt_off0000be4c.bin
7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4C 2268 bytes
font_02_sfnt_off0000c85c.bin
ecf61259e1ea2d61c4fa6cf48b550a13b5d1daf036b46e38acfeb73e059b3e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC85C 11188 bytes

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