Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f70a3b70638b3b8…

MALICIOUS

PDF

40.4 KB Created: 2020-08-28 06:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 898bcb30224c80113a88f02d5648f8ba SHA-1: 00a989ab6a04e98ff5673ac5df9872c138231be2 SHA-256: 7f70a3b70638b3b88db599b54b678dcc531461d333d88335fa35237864f70a2a
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a redirector service, which is a common tactic for phishing and malware distribution. The heuristic firings indicate the PDF is designed as a link farm, likely to obscure malicious destinations or to generate traffic. The document body itself contains the primary malicious URL and several benign-looking PDF links, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=stevie+wonder+you+and+i
    • http://files.trofefashion.com/uploads/1/3/0/7/130739308/buput.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/4966/2117/files/tuwuserali.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/amnesia_retrograda_y_anterograda.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/zamutujitenemal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/refafuzigopo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/merikakotununoranire.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/85182592922.pdf
    • https://cdn.shopify.com/s/files/1/0435/0482/8580/files/network_security_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/mojawimari.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/59932190716.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/wondershare_to_word_converter.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/35527529096.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056f6.bin
38bde75a9740f03a2b7c043a64979e5b8206f7a2e4af65a63483096ab76aeeef
pdf-font-stream PDF embedded font (sfnt) at offset 0x56F6 4968 bytes
font_01_sfnt_off000067f4.bin
994e7822b1fb56bffb26d437483d35b95203e491f59001fb2ca858f515f03ea0
pdf-font-stream PDF embedded font (sfnt) at offset 0x67F4 2128 bytes
font_02_sfnt_off000071c3.bin
294c9ccffe29c32b05d56de6b4a3ba030c7a52d53d984b803455b56193980ad7
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C3 9844 bytes