Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbed2724f2b262c…

MALICIOUS

PDF

42.1 KB Created: 2020-08-05 09:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f916a1d30d3d42a08a2e4543120359b SHA-1: 193cebfa9483c7a8cd08bac8091f31ec7d3426b4 SHA-256: ddbed2724f2b262c3f2d63e15f08a083eb258f3211126fe77de4e7887bfe96d0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'grammar worksheets' and a URL that appears to be a lure. The primary malicious URL identified is https://ttraff.ru/wb?keyword=grammar%20worksheets%20quantifiers%20some%20any, which is likely used to redirect users to further malicious content. The presence of multiple Shopify URLs suggests an attempt to blend in with benign 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/wb?keyword=grammar%20worksheets%20quantifiers%20some%20any
    • http://files.charlottesabourin.com/uploads/1/3/0/7/130775222/3a46d907a00b.pdf
    • http://rumef.mycrnagora.me/uploads/1/3/0/7/130740044/8171348.pdf
    • http://files.margaretraab.com/uploads/1/3/0/7/130776476/xejazomejox-vixojumupomu-vuxenuxabero.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/wixoxuzamoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/belegulonotemuvoseve.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/baby_thank_you_note.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/piwivibadujikubaxiragof.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/ketulepolowonififedebut.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8299/files/jonaginatadowix.pdf
    • https://cdn.shopify.com/s/files/1/0438/3545/7698/files/my_guitar_shop_database_exercises_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/9679/2471/files/47617191732.pdf
    • https://cdn.shopify.com/s/files/1/0428/0880/3495/files/91079670946.pdf
    • https://cdn.shopify.com/s/files/1/0434/6927/5286/files/81729094195.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/iptables_ddos_protection.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_off00005a75.bin
4f8d670fa172f0ebd22a79bacd0eee3964910e2473f81ec76ae87d2b98f19d62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A75 5272 bytes
font_01_sfnt_off00006c5f.bin
34a6032953730c9f15b0e865da72452f9a9db3499842e0edda97858e37354f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5F 9712 bytes
font_02_sfnt_off00008d59.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D59 4324 bytes

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