Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e20cd99a7e1f9c4…

MALICIOUS

PDF

41.7 KB Created: 2020-09-18 16:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06d489aa6e602c82450b2252c596ea5d SHA-1: d0c63e2963347f5e6fe4bd6cf4391c1e5ea7c450 SHA-256: 4e20cd99a7e1f9c4efb64d6531ab5fb5c4c7979c1b48939590a1565f82be9891
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a malicious redirector link disguised as a study guide, which is a common social engineering tactic. The ML classifier strongly indicated maliciousness, and the PDF was flagged for containing a link farm. The primary malicious URL is https://ttraff.me/wix?keyword=to+kill+a+mockingbird+chapter+4-7+study+guide+answers, which likely leads to further malicious content. No scripts were extracted from this sample.

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.me/wix?keyword=to+kill+a+mockingbird+chapter+4-7+study+guide+answers
    • https://8cf81f8a-bcc6-4e26-a259-2b5195071a23.filesusr.com/ugd/e54fc7_268e961579d24abf8027d3b50611b161.pdf?index=true
    • https://9e01b929-ed55-4dad-b6f0-545dc634a4a5.filesusr.com/ugd/d17951_ec15e40e94d34f4488cf2a112e4a1fb6.pdf?index=true
    • https://874b1ffb-3dda-4ad7-84d0-6610b2b6355b.filesusr.com/ugd/771ea4_0db10a72a612423b8b43378ad35fabc5.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0438/3450/7426/files/labiotte_sheet_mask_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/xujowegizedo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2506/2298/files/giwejoxuxodulizoxupiva.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/21202514354.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/wukolafetiluzafowupediwa.pdf
    • https://c823123c-b182-45fb-99a5-1b0918a75f14.filesusr.com/ugd/7d1dc9_d7daf20e23bd4d88b85c820435176281.pdf?index=true
    • https://1e7d29fc-b943-46c9-a1a6-addf95f1e35a.filesusr.com/ugd/3a38e0_61655bb654e6462ea9d7ee3f4aa2044b.pdf?index=true
    • https://48228f9e-beae-4db5-94c2-65e811c2f176.filesusr.com/ugd/4d548e_4524e3d280da4853822b3defdfc2c607.pdf?index=true
    • https://33456c22-c331-4955-b475-7dc79b5b2310.filesusr.com/ugd/70e5f7_dd298829f2274dec8d4a14aa5b5b399b.pdf?index=true
    • https://a9322646-cd5a-4da2-8c50-d6545196c623.filesusr.com/ugd/a2de88_97050728cdc34c2399006115571d6df1.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/0304/2216/files/23159686140.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8686/files/vebubodezigivowozujadejo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/bhagavad_gita_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/celotex_ga4000_50mm_data_sheet.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/
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/bhagava

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000638a.bin
5b2b9945758a6baa3d56b4122c5249afe8c7cacf410084fda554699664dfdb15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638A 6032 bytes
font_01_sfnt_off00007806.bin
5ab3573d5b75572087573c0b5e6c87a663019bc8cddf70327987b2146aeb1c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7806 9832 bytes

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