Malicious PDF — malware analysis report

Static analysis result for SHA-256 930d82c439b20e31…

MALICIOUS

PDF

46.5 KB Created: 2020-08-04 16:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 231ed942bc95d5fad1c22ea0ce9aefce SHA-1: 20272d7d9df271b78398f965889a1e5615670d80 SHA-256: 930d82c439b20e318a8c74bb3fc3cb57f11ced1f4a154d922e38e593409f911c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=south+sudan+history+pdf'. Additionally, it features a link farm with numerous external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to PDF files, reinforcing the 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.cc/pify?keyword=south+sudan+history+pdf
    • http://files.firstpresbyterianedgerton.com/uploads/1/3/0/8/130814877/wedewedadikim.pdf
    • http://files.silveradodistrictoes.org/uploads/1/3/2/8/132814680/648b299.pdf
    • http://files.ruralchurchpastorsnetwork.com/uploads/1/3/1/8/131856166/0c07c28fe43.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/15219858758.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/movawarajesogefigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/64798594218.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/77479226296.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6060/files/62942134956.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/kuvelizaritonekugowevino.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6367/files/31547915721.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/lalasutuvuduxadi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/satisisurapowaxajixik.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4682/files/nefajuwululipox.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/keropuwezovurev.pdf
    • https://cdn.shopify.com/s/files/1/0430/0315/0499/files/74524980263.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/28062664275.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_off00006abd.bin
5906f4da765dac770bd2b6152f9bbaba928304d4121669e0fcab2f795434f68a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABD 5068 bytes
font_01_sfnt_off00007be7.bin
58f451446cf43f8686385d2bf5f84a8dbca4c3acb20c550be01d5ed18278eba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE7 10340 bytes
font_02_sfnt_off00009f3d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F3D 4324 bytes

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