Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa0f2ec3a7d9db0…

MALICIOUS

PDF

43.1 KB Created: 2020-08-15 10:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb156dbf2c3f1de2f284801c95cb3738 SHA-1: 79f1b58a553638455c497c95835945786ddc580d SHA-256: 8fa0f2ec3a7d9db0be04fb235167dc6df81ef314b887b6ba6e06ffcb6b1390b6
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/wb?keyword=clauses%20worksheets%20grade%207'. Additionally, a PDF link farm heuristic indicates the presence of numerous external links, many of which are hosted on potentially compromised or malicious infrastructure. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to disguise malicious content as educational material.

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/wb?keyword=clauses%20worksheets%20grade%207
    • http://ranukesuv.villageofevansmills.com/uploads/1/3/2/7/132712358/5998647.pdf
    • http://files.conciearth.com/uploads/1/3/2/6/132682822/4857549.pdf
    • http://files.alphahomehealthandhospice.com/uploads/1/3/2/7/132712661/juwoxirepidagavuboz.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/the_red_sea_rules.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/business_standard_english_epaper_download.pdf
    • https://cdn.shopify.com/s/files/1/0445/6975/5812/files/carcassonne_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/1666/4734/files/17114007779.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/92093339097.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/bewezabem.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/66425421637.pdf
    • https://cdn.shopify.com/s/files/1/0430/8818/3456/files/gobatepepikoriretafok.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/firadelusajofubetojifodi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7369/2063/files/wabunuwigame.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/scribblenauts_ds_answers_5-_5.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_off00005e40.bin
c7bf2f6185cf3af6c7c70688d6ff98510c36636a8233ea564f58595352e19974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E40 5072 bytes
font_01_sfnt_off00006fb7.bin
d6620dbfe2044d600d71243d72a900c4cd3c4daab442ad26cdbc85a5eb1ed476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB7 9948 bytes
font_02_sfnt_off000091c4.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C4 4324 bytes

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