Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8154fb84c419b6f…

MALICIOUS

PDF

45.1 KB Created: 2020-08-19 22:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2953151c2ad7509ca7d7bc4a386b36cc SHA-1: 2cf4e7e098c5791fbe5d834cc87864ff201d999e SHA-256: f8154fb84c419b6f813737a98e39545700f55f128f9db01300ba911ed1c7ba7b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=verizon+halftime+report+anchors'. Another critical heuristic indicates a PDF link farm, with the first URL pointing to 'https://cdn.shopify.com/s/files/1/0433/8368/5270/files/patuvuwoji.pdf'. The document body contains garbled text but includes the aforementioned URLs, suggesting a lure to external malicious 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.com/pify?keyword=verizon+halftime+report+anchors
    • http://xumikudon.edgeshowcase.com/uploads/1/3/1/4/131437736/2145160.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/patuvuwoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/4206/9918/files/hmrc_capital_gains_manual_entrepreneurs_relief.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/66301894479.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/gumabivimezefafaxek.pdf
    • https://cdn.shopify.com/s/files/1/0432/5218/7298/files/vofovowajodimatubububepof.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/high_school_honors_chemistry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/56592252487.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/arrancame_la_vida_partitura.pdf
    • https://cdn.shopify.com/s/files/1/0441/3492/4440/files/xazaweko.pdf
    • https://cdn.shopify.com/s/files/1/0439/6960/9886/files/45109594699.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/fevifazepidejipomut.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/91405702398.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_off00006418.bin
91a99cff1e894ddd06524e47a0567059f4662f2f5b9eefb25c5cd0b4d8e4cd69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6418 5060 bytes
font_01_sfnt_off00007518.bin
2f3042ccfdcb70da9a4ea0041d92243fdc9932e5b61f9a7741209efa097d15c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7518 10684 bytes
font_02_sfnt_off000099b0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99B0 4324 bytes

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