Malicious PDF — malware analysis report

Static analysis result for SHA-256 823ff0e023676c50…

MALICIOUS

PDF

52.9 KB Created: 2020-08-25 15:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d220cb80631bd395caf816fb62cb0722 SHA-1: ccdcd74f745e07d0740bd796d691a725f15ea36c SHA-256: 823ff0e023676c501b9199a2d177b135a2693bca781ff18e826aa99854df2c15
174 Risk Score

Malware Insights

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

This PDF document contains a link to a known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=ark+survival+evolved+server`. The document also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which point to Shopify-hosted files. The ML classifier strongly flagged this PDF as malicious, and the presence of a link to known malicious infrastructure supports a high confidence assessment.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/pify?keyword=ark+survival+evolved+server
    • http://files.hodaielab.com/uploads/1/3/1/8/131871414/borolon.pdf
    • http://files.huizhenghome.com/uploads/1/3/0/7/130740213/7837661.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0452/1410/5760/files/frying_pan_shoals_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/1798/4410/files/nadra_pakistan_b_form_tracking.pdf
    • https://cdn.shopify.com/s/files/1/0437/6402/3450/files/aludecor_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1822/files/xokenazedolugixop.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/durinol.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/jegare.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/aleks_math_answers_algebra_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4255/files/pivelidivifurakokara.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/gutigovijukijazurinete.pdf
    • https://cdn.shopify.com/s/files/1/0432/8013/8398/files/mtg_arena_preparing_assets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38659434623.pdf
    • https://cdn.shopify.com/s/files/1/0437/8745/2576/files/expedicion_botanica_nueva_granada.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e16.bin
09302872746ff5f2874d258be463671d68de10a0720b33409336841e626ca88e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E16 4628 bytes
font_01_sfnt_off00007dd6.bin
837b6e39a7b66bb01cfaf2e9c31813d93fed6dd27750a8842fb0121a66b44760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD6 10820 bytes
font_02_sfnt_off0000a304.bin
dc3b9bb384ec389eb018e720636209dca2402da348cf6bc0257d6e032c88d201		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA304 16180 bytes
font_03_sfnt_off0000b831.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB831 4324 bytes

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