Malicious PDF — malware analysis report

Static analysis result for SHA-256 081883582608ddea…

MALICIOUS

PDF

55.4 KB Created: 2020-08-03 15:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d2d3e1f9887fc3429d7fd0dd4e1fcb1 SHA-1: de70ff397d1cfa06c9714ccf272f7c9990aad36e SHA-256: 081883582608ddeafe47501116c9f4490ba075bcacf51bef5c3d660e26b7acf4
202 Risk Score

Malware Insights

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

The PDF contains multiple links, including one identified as a malicious redirector, which likely serves to obscure the ultimate destination. The document body and heuristics indicate a lure to download further PDF content, potentially leading to a malicious payload. The presence of numerous PDF links suggests a link farm or a method 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=download+surat+al+waqiah+arab+dan+latin+pdf
    • http://files.dorebowen.com/uploads/1/3/1/6/131607174/3994866.pdf
    • http://files.stayprotected.org/uploads/1/3/2/6/132682293/bozagipufosurok.pdf
    • http://files.kaneswriting.com/uploads/1/3/1/4/131483955/funesuri.pdf
    • http://files.foundationsofadolescentministry.com/uploads/1/3/0/7/130739285/7913455.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/onan_generator_4000.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9363/files/zoluduv.pdf
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/58810826318.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/20484997201.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/52012592338.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/mobinid.pdf
    • https://cdn.shopify.com/s/files/1/0440/1384/6693/files/betovixote.pdf
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/84945869167.pdf
    • https://cdn.shopify.com/s/files/1/0431/3245/3030/files/94_chevy_silverado.pdf
    • https://cdn.shopify.com/s/files/1/0438/7926/8520/files/1526827148.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_off0000aa62.bin
ca8ef1f52e9c498f22e8373d5921209f88481a753a16d696d14dc785b8314c56		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAA62 21440 bytes
font_00_sfnt_off00006b41.bin
560eedb2abb694943899355c8826201ec227025153f89b1a3f5fb52d0cf7915e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B41 5484 bytes
font_01_sfnt_off00007df0.bin
5bc9b513ffdf2bcc2adc955ab6606a1c174d3f52279ac2df429f813dee81eb7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF0 13976 bytes

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