Malicious PDF — malware analysis report

Static analysis result for SHA-256 91099dd9ccd9096a…

MALICIOUS

PDF

40.2 KB Created: 2020-10-04 21:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9d07677baf72045cf24c001964c2f686 SHA-1: e3bc84af85bc76bfd1407ab49394c5b154e391c3 SHA-256: 91099dd9ccd9096a54db99c33ea099be8c7d42df8df8f98f5ed960a8f68ff913
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The document body, though partially obfuscated, includes a URL that appears to be part of a link farm designed to drive traffic to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

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.club/pify?keyword=how+to+make+a+villager+follow+you+in+minecraft+pe In PDF document text
    • http://files.themoveablechurch.org/uploads/1/3/0/8/130874128/9175303.pdfIn PDF document text
    • http://dafoni.tldsgn.com/uploads/1/3/1/3/131398367/jasisetelurip-davewedibeki.pdfIn PDF document text
    • http://buvoneri.theparklinenc.com/uploads/1/3/1/3/131384613/2b350ff00e97e1d.pdfIn PDF document text
    • http://files.ceciliaviney.com/uploads/1/3/1/8/131857140/c8fd6.pdfIn PDF document text
    • http://ripavaz.malamalearningcenter.org/uploads/1/3/0/8/130814004/893572bd9bc.pdfIn PDF document text
    • http://xojotenej.ararted.org/uploads/1/3/2/7/132712380/75df6b.pdfIn 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/1/0457/0805/0588/files/magpul_moe_rifle_stock_kit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1661/6096/files/foo_fighters_everlong_lyrics_print.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/distribution_map_science_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1907/8301/files/pelasazigijazejumaxut.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_off00006046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6046 5436 bytes
SHA-256: 7efb0e3c8fa4cc648a4e7d019b02ee72784a69d096344b5f45c16db8f8236303
font_01_sfnt_off000072d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D3 9808 bytes
SHA-256: ece1298736766c3ad4b8e75a0bd9a4ad664791bc771c5aa49c1a8e9a566104ef

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