Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a6f35d756924e2…

MALICIOUS

PDF

42.6 KB Created: 2020-08-09 00:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9a2892f0eeccb6c9f87a523544c42d7 SHA-1: 39085ec999863e8f607e9805da56d88b6ba586bd SHA-256: 81a6f35d756924e2b5b157a9a9b6c20d80e9c5126c1d098c9d97b0d8c6c07d4c
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL and appears to be a lure for users interested in bodybuilding. The presence of numerous external links suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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=the+encyclopedia+of+modern+bodybuilding+pdf
    • http://duwuge.centerponddistrict.com/uploads/1/3/1/3/131398140/zugusakozasulewezus.pdf
    • http://files.amorrusticarts.com/uploads/1/3/2/3/132303075/gapuwakupap.pdf
    • http://files.pendowerhouse.com/uploads/1/3/0/7/130775156/1e939a3e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/33098499593.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/dizupigoma.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/36396486552.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/58595542764.pdf
    • https://cdn.shopify.com/s/files/1/0429/5675/1002/files/wipamanisamuziba.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4229/files/41633131185.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/dowonunosalewibetelageje.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53981477141.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/vuzaxev.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/academic_transcript_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/63450290948.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8620/files/gaxijekepovivakuri.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/65970843016.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_off00006794.bin
75917f589803d671b2fea33cb1765fff3cae16e3cf88640c1a58033feb5839e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6794 5584 bytes
font_01_sfnt_off00007a70.bin
05e60a0fdc6ba94d3b106cab24c7006e453fb6ce2b3381badb89c00b6f405788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A70 10216 bytes

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