Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18d3fcb378be230…

MALICIOUS

PDF

55.5 KB Created: 2020-10-31 20:06:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 898fba7c08d9bd87f7e867e919051a53 SHA-1: 1c7bfae20acaf0b7a7080b639da6eb5121ba4620 SHA-256: a18d3fcb378be2302cd026f6fd0c3ac0f149ec4c2d7f79746d89763edb4543c5
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.001 User Execution: Malicious Link T1598.003 URL/Domain Information Gathering: Link Shortening

This PDF document contains embedded links that redirect to malicious infrastructure, specifically masquerading as an 'Amazon chat history customer service' lure. The document also includes a callback phishing lure, prompting users to call a phone number. The presence of numerous external PDF links suggests a link farm for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cctraff.ru/aws?keyword=amazon+chat+history+customer+service
    • https://puvujoda.weebly.com/uploads/1/3/4/3/134326666/8581223.pdf
    • https://gabexilo.weebly.com/uploads/1/3/4/1/134109250/bf4882.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0266/9350/1106/files/21698187701.pdf
    • https://uploads.strikinglycdn.com/files/a7168b91-25ba-47e7-9508-56aad1146232/47395753536.pdf
    • https://cdn.shopify.com/s/files/1/0268/8077/0224/files/15486227764.pdf
    • https://s3.amazonaws.com/tetazino/59165648875.pdf
    • https://uploads.strikinglycdn.com/files/ffa55514-ce14-4283-99c5-15a58a4475c7/nikademorewubodowow.pdf
    • https://s3.amazonaws.com/dinilederu/66865504270.pdf
    • https://s3.amazonaws.com/jidosatikim/78416912186.pdf
    • https://uploads.strikinglycdn.com/files/62a546dd-c34b-44d1-a6e0-241905d8ac1a/20565453645.pdf
    • https://s3.amazonaws.com/bakoloj/math_for_machine_learning_richard_han_download.pdf
    • https://s3.amazonaws.com/numegubowalonan/79483368599.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a8fa.bin
eeb692044f5d80d83ed29d21a07bfe1c412aeb22f9bd42ff0b1ff5d147d23a5c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA8FA 22828 bytes
font_00_sfnt_off000071e6.bin
1919e09729542e4c8af64f3e371d3d9ac20c8ba3e183db47c556ac321509843a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E6 5208 bytes
font_01_sfnt_off0000837d.bin
c6aebe56aeb4f67fa0c44771b392b2cabc79ae7f08a504e23687fc7358ed3141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837D 10996 bytes

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