Malicious PDF — malware analysis report

Static analysis result for SHA-256 757e6551d9bdea79…

MALICIOUS

PDF

44.4 KB Created: 2020-08-18 23:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c917c8e95268d61439d4e2729be9c326 SHA-1: cf479f5dd93b14b14b7f60a0991937e1cf3438c5 SHA-256: 757e6551d9bdea791dec6fff11f717116a0474a0da00287e42da9de6db48e1cc
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains multiple embedded links, including one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=eraser++windows+8'. The presence of a 'download button' lure and instructions for a password-protected archive suggest the document is designed to trick the user into downloading and decrypting a malicious payload. The ML classifier also strongly indicated maliciousness.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=eraser++windows+8
    • http://gomexoruv.texasranchlife.com/uploads/1/3/1/4/131405965/5240130.pdf
    • http://mimufu.renaissancevitality.com/uploads/1/3/2/7/132712461/0a15bfdf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/dekutov.pdf
    • https://cdn.shopify.com/s/files/1/0435/2419/4468/files/zelupominefuvu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1829/files/ziwir.pdf
    • https://cdn.shopify.com/s/files/1/0437/9181/0717/files/fokefidavituxewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92904811518.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/nifukoxavalozud.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/63294482974.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/45401303653.pdf
    • https://cdn.shopify.com/s/files/1/0433/9616/9886/files/gebibaxokamatozibufazul.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9494/files/72606725508.pdf
    • https://cdn.shopify.com/s/files/1/0433/1280/8091/files/oxford_university_press_catalogue.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000712f.bin
5a5ea91561504efbfd6f6aaa0e33956edce3139f6618400e31f10a0ff20129e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712F 5032 bytes
font_01_sfnt_off00008269.bin
a5d90676098e629073aaeecf6983582b758e8848e4b9d5217c38772f518b50ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8269 10216 bytes

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