Malicious PDF — malware analysis report

Static analysis result for SHA-256 274688c0ccb46986…

MALICIOUS

PDF

55.5 KB Created: 2020-08-07 00:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e522095c3954cc2e9e73149a1cebe095 SHA-1: 4238b7bd160fc1badd46847ac24f4b5a84193919 SHA-256: 274688c0ccb46986848b04d8390a5c42d5e5c61abc6bdb4a10d7f0c8579e0531
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary malicious redirector URL pointing to 'https://ttraff.cc/pify?keyword=vorlagen+bautagebuch+pdf'. This indicates a likely attempt to distribute malware or phish users by disguising the malicious content as a construction diary template. The ML classifier strongly supports the malicious nature of this PDF.

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=vorlagen+bautagebuch+pdf
    • http://files.compliancecurrent.com/uploads/1/3/1/6/131606550/vabinopijupadunev.pdf
    • http://files.oldpixhamschool.com/uploads/1/3/0/9/130969057/goriwewa.pdf
    • http://files.nunyabeeswax.net/uploads/1/3/1/6/131607232/bb67f06b9f7b.pdf
    • http://files.eldermooninternalarts.net/uploads/1/3/0/9/130969129/bd3b813c.pdf
    • http://files.pickneychannel.com/uploads/1/3/1/6/131606373/07e4927ba11a5.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/vojaxoja.pdf
    • https://cdn.shopify.com/s/files/1/0433/8194/8567/files/66482999666.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/76030442655.pdf
    • https://cdn.shopify.com/s/files/1/0431/9949/6351/files/luwovokababoxiloduzex.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/43831372653.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/18453897219.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/2824378790.pdf
    • https://cdn.shopify.com/s/files/1/0433/7909/7758/files/nidiwozobisoforiweko.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/vakiweje.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/wixijamezepaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdf
    • https://cdn.shopify.com/s/files/1/0441/1791/7848/files/comparison_degrees_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/nepiruxowitak.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ef9.bin
825613c433ac0229025ec5a4960b47772b8a6ac27bc5b729b4fa86b477978775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF9 5344 bytes
font_01_sfnt_off0000a11e.bin
706e50f55c085f20092eb8749e30ce2da020795f8679d8a3dfdb3deb211767a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA11E 15872 bytes

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