Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c994d0a75e949b8…

MALICIOUS

PDF

38.9 KB Created: 2020-07-08 21:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7bf9f21dda511df62dbe253469a78f6 SHA-1: 0800500547db7d66e19af36cf8d686ad5bdcc6d0 SHA-256: 8c994d0a75e949b89a0ddadeb124c599af20d2c9b062bf4481ed0687f87b45bf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to domains associated with SEO spam and redirector infrastructure. The document body, though partially corrupted, suggests a lure related to a 'Farberware triple slow cooker manual'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of the links leads to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=farberware%20triple%20slow%20cooker%20manual
    • http://files.shellyjarvis.com/uploads/1/3/0/9/130969548/1356993.pdf
    • http://files.artfultim.com/uploads/1/3/1/4/131438002/kijerumofuzozasaluvu.pdf
    • http://files.henryhomes.site/uploads/1/3/0/8/130874458/4bece561.pdf
    • http://files.darbyplainsdanes.com/uploads/1/3/1/1/131164418/4274122.pdf
    • http://files.cobilconnect.com/uploads/1/3/0/9/130969853/6ea8d66a.pdf
    • http://files.kathyknorman.com/uploads/1/3/1/4/131437225/a78ffb2ccf49b.pdf
    • http://files.gearstoyou.com/uploads/1/3/2/6/132695493/kapafasidobo.pdf
    • http://files.shop-black-moon.com/uploads/1/3/1/4/131409055/wagazalesofo_newepavewerediz.pdf
    • https://vupejoru.files.wordpress.com/2020/07/tafepeduputopizak.pdf
    • https://jogapodu.files.wordpress.com/2020/06/biritejomajatakuvekofegad.pdf
    • https://gofifod.files.wordpress.com/2020/07/31983005430.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/norojakibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059fe.bin
d799a0dca666fc35a3525247a889eb758b94864015ba822ff53c3ef9359ecd11
pdf-font-stream PDF embedded font (sfnt) at offset 0x59FE 5212 bytes
font_01_sfnt_off00006bb5.bin
48c6159207d361a013681b5529d23d52abf3332ed834b84e630d5fdfe146f8cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB5 10208 bytes