Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8d09fdc6c79807…

MALICIOUS

PDF

65.1 KB Created: 2020-08-05 10:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca6cfc251d3113197341d5382721e7e1 SHA-1: 28ee1cae8127870e09b26bb4ea76aab98c2a424b SHA-256: 3b8d09fdc6c7980759e8a5c4d4e55e41a811c19df7435223ee498303539e0ddf
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One prominent link, 'https://ttraff.cc/pify?keyword=99+names+of+allah+in+english+translation+pdf', is flagged as a malicious redirector. The document body text, though garbled, includes the same search query, suggesting a lure to entice users to click the malicious link. 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.cc/pify?keyword=99+names+of+allah+in+english+translation+pdf
    • http://files.sacredmotherarts.com/uploads/1/3/1/4/131437987/nekuvu.pdf
    • http://files.rocktron.com/uploads/1/3/1/8/131872087/4d45f0.pdf
    • http://files.wdhicks.com/uploads/1/3/1/6/131637658/4476522.pdf
    • http://files.bethcaindesigns.com/uploads/1/3/0/8/130814252/2005208.pdf
    • https://cdn.shopify.com/s/files/1/0437/2122/8442/files/walker_cinemas_north_ogden_ogden_ut.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/ximiwelov.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/89938111422.pdf
    • https://cdn.shopify.com/s/files/1/0436/7728/6565/files/30564059760.pdf
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/labesanojopirerufelokufix.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/5e_grave_domain.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9204741539.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/articulos_de_hernia_discal_cervical.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/zikuvozovudoxoxunadukodow.pdf
    • https://cdn.shopify.com/s/files/1/0429/0982/7231/files/9794443233.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0822/files/rubipamikizuzedugag.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1157/files/61955414239.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000c3c6.bin
f73e87dcd74e92b5e9b72606b7ea313011dd3ea07bf3eaaedda3b206fdb7aa09		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC3C6 29228 bytes
font_00_sfnt_off000081a3.bin
03dfcc825ad007493ce2a037a0d0f3654180283c4de19de3b2fbe1bd2dfb37b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A3 5516 bytes
font_01_sfnt_off0000943b.bin
eab1d2b04e5a98e5b22d9357d20c7879b738f547066aee264397b3b79ee6a174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x943B 15364 bytes

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