Malicious PDF — malware analysis report

Static analysis result for SHA-256 169fcd4adf9c976d…

MALICIOUS

PDF

40.4 KB Created: 2020-08-04 16:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b16425519387bcff32fd368ac7611734 SHA-1: d0e800cbc5c94a3c665fc48d33c9c24fa2fedeae SHA-256: 169fcd4adf9c976d233a988399fd108340beb526218e8378b92ec04cf9a517da
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Ngo bylaws pdf in english' and the authoring application is wkhtmltopdf, often used to generate PDFs for SEO link farms. 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/pify?keyword=ngo+bylaws+pdf+in+english
    • http://tefolir.designs-by-nathan.com/uploads/1/3/1/4/131453041/5797017.pdf
    • http://nufab.enidbridalshop.com/uploads/1/3/1/4/131483200/4820946.pdf
    • http://files.graemetresidder.com/uploads/1/3/2/7/132740186/860fc937.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3100/1238/files/11105716539.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2534/files/11380712263.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/43704704247.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/89157768420.pdf
    • https://cdn.shopify.com/s/files/1/0429/0124/2015/files/denorejetigejalibuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/5874/7800/files/kewupubafesudaparog.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/jeep_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/debodurexowozimojutobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8761/7436/files/vimumur.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/dinetizube.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006019.bin
e264bd079cc8a53ed40871e3ff0aaa3dacfdea0febd6c806b7916045fa4adc22
pdf-font-stream PDF embedded font (sfnt) at offset 0x6019 5508 bytes
font_01_sfnt_off000072f7.bin
23ee72bb51a285773c4d05ba6ba3a4d80922f154da4161873da143cda815ea84
pdf-font-stream PDF embedded font (sfnt) at offset 0x72F7 9908 bytes