Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4a12c88c944726…

MALICIOUS

PDF

37.7 KB Created: 2020-08-15 03:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e84554aeac5031ce911ff7c4f908d75d SHA-1: 110fc64f740fa7d5db6210dda8df7921e0df134b SHA-256: bc4a12c88c94472655dcfba4e49445f787aa5ff72de6106444248882d649dd7f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, creating a link farm. One of these links, https://ttraff.cc/wb?keyword=spinning%20song%20piano%20pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL, suggesting the intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=spinning%20song%20piano%20pdf
    • http://filipaja.yourcrystalriver.com/uploads/1/3/1/4/131408970/c47f25939f4ffe9.pdf
    • http://files.cam-efi.com/uploads/1/3/1/8/131856160/rolowavenonizawifulu.pdf
    • http://files.theguildnola.org/uploads/1/3/1/1/131163851/8375021.pdf
    • http://files.paulinedodd.com/uploads/1/3/0/7/130775021/sonokorap-vitugefufike-zezeko-wuviwe.pdf
    • http://wovaxega.streamingmadeasy.com/uploads/1/3/0/7/130775169/1925592.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/freshly_squeezed_menu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/redugakanirepax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/698583268.pdf
    • https://cdn.shopify.com/s/files/1/0437/9954/3970/files/lds_bishops_storehouse_order_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/hydrogen_mod_menu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/9191004429.pdf
    • https://cdn.shopify.com/s/files/1/0435/6790/6977/files/25301057668.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/73491564325.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/lopobufusasiwisubigun.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/kizozomewolamupipakudoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/67672049533.pdf
    • https://cdn.shopify.com/s/files/1/0432/9357/3284/files/dolegefamatabubawad.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3307/files/1706371086.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_off00004c1f.bin
ea628845e909f0db6b76adf4b3a1a2668ccf0dcb1b1a23be88de4d4eb6297c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1F 4776 bytes
font_01_sfnt_off00005c56.bin
52e709ed4c03b4508687cf1b43ef7471cf01f36bc6ec875817874e0e942ab394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C56 9180 bytes
font_02_sfnt_off00007ba7.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA7 4324 bytes

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