Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c40bc24491abd2…

MALICIOUS

PDF

43.6 KB Created: 2020-09-04 13:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 17d793558aa6fc3a031bdd8876715fdd SHA-1: 7e6d15c79bbbc5cffff556722295f244eaa4d039 SHA-256: 76c40bc24491abd20b11a5972f4f652e5a6444b6bb041c9fc155e6a7d9037db2
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL that is flagged as malicious, disguised as a search result for a technical topic. The PDF also contains a large number of links to other PDFs hosted on Shopify, likely part of an SEO link farm. The ML classifier strongly indicates maliciousness. The embedded content, while heavily obfuscated, appears to contain the malicious URL and other benign-looking PDF links.

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.me/wix?keyword=sql+reporting+services+default+date+parameter+today In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/40279088355.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/kanakofoguxikolewew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8566/8259/files/fuwonusata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9934/9407/files/philadelphia_street_map.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e4ff69_504091e7108143399708c9da892e90a7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_4d77737b94d848dcb854940b484f6258.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2dc492b0b03549709b0c968f3d0f165c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65621046881.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9087/8372/files/recommendation_letter_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/bijedopimamezuboxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/47658089618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/96906149324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2511/0952/files/paper_bow_tie_pattern.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6463/1189/files/boxob.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D4 5864 bytes
SHA-256: e72f6ddc9922978845d50697e83d6003897dd8ba5dc260c50930c67dbcb96ad2
font_01_sfnt_off00007cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC3 10740 bytes
SHA-256: c09d854febc6d5d064da6a7a1ead415e55552a555af4df3f9bb90279cdd466b9

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