Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfd1db9d0ff220f…

MALICIOUS

PDF

42.8 KB Created: 2020-08-18 15:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a860474fa2a386c5e684d32e3985274f SHA-1: 9eaffc6db4fd8498633f37dc22176fa51f1ff525 SHA-256: ddfd1db9d0ff220f9a4a5c20bde790debd11d3b73f5b1d6ba4f4950f79bc59f1
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily corrupted, contains the string 'Apps apple store uk' and the malicious URL, suggesting a lure to a potentially malicious app store or related content. The presence of numerous Shopify-hosted PDF links indicates an attempt to obscure the malicious redirector within a large number of seemingly benign links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=apps+apple+store+uk
    • http://files.zazenphoto.org/uploads/1/3/0/9/130969702/tivej.pdf
    • http://files.brgri.org/uploads/1/3/1/4/131437443/8840537.pdf
    • https://cdn.shopify.com/s/files/1/0430/8513/6021/files/doxivurekavevel.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0872/files/widerevoruruzeluleku.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/jijujupamo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/break_up_boss.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0831/files/.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/kepivugugupisizemozawamop.pdf
    • https://cdn.shopify.com/s/files/1/0436/1909/0595/files/student_exploration_carbon_cycle_gizmo_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/tewuputa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/dixon_illinois_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6647/files/nakulawufalepo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/simple_letterhead_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/3410/6277/files/bonetrousle_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/fuwivotufewexurekuzopi.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_off000067eb.bin
50a6f49ec87edb7159229f73807558edb4c5a9c89b30917107744c39dcb184e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EB 4868 bytes
font_01_sfnt_off00007889.bin
8b66c34e0094b13c22e63c90dcf33ab2c81f35164f60205ae867616d3857de2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7889 11480 bytes

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