Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcecc8af80033a0…

MALICIOUS

PDF

46.5 KB Created: 2020-08-04 23:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db7f4e28cf2ad33ae56c5b8d5648e0bb SHA-1: 4e4731f03abe21bef69f25b1a40b6cfbe5a80fcf SHA-256: edcecc8af80033a00f82fd9aeee691fada78fa705aa694b83b3da45d1fbaaa7d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a document about effective communication. The PDF also exhibits characteristics of a link farm, with numerous embedded links to other PDFs hosted on Shopify. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be social engineering through a deceptive document lure.

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/pify?keyword=difference+between+effective+and+efficient+communication+pdf
    • http://files.amystephenmusic.com/uploads/1/3/1/4/131407284/7414820.pdf
    • http://files.mycityadd.com/uploads/1/3/1/1/131163879/b7d68c63bac3a.pdf
    • http://files.stpatsni.co.uk/uploads/1/3/1/6/131607063/9860384.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0536/files/punaxebebalugefise.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3071/files/tebefimusubijutisafuwikuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2283/files/algebra_ii_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/79255094879.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/tilakenoputafi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3852/3047/files/merit_badge_ebooks.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2060/files/35321558027.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1411/files/digaririlikizitoduninizat.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7982/files/92798476726.pdf
    • https://cdn.shopify.com/s/files/1/0434/2638/1975/files/4459791952.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/8706825902.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/73790358697.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/pujovivetujenafigu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/php_db_classes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.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_off00006a27.bin
b537717b748c3e183f8d8996d0d98ae5f57b83ca63e37a3aa70753ac6a2dfd0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A27 5264 bytes
font_01_sfnt_off00007c05.bin
58204fbb39b85e65e213077627f5b2869fcfade7ec8fc532720413b2a42f4b96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C05 10068 bytes
font_02_sfnt_off00009e6d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E6D 4324 bytes

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