Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad8ad8ccfbd529c…

MALICIOUS

PDF

40.8 KB Created: 2020-08-14 12:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7ae8abc9092cb0ac4473fda9bcbcc37 SHA-1: a3a9026f612f9dacd11f4da4e8e33b494fe83cc6 SHA-256: 6ad8ad8ccfbd529c99cc3c7224e2ade101321caaed5ca00fc0832fdc1fd5f901
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common tactic for distributing malware or phishing pages. The document body and embedded links suggest a lure for free PDF downloads, likely to trick users into visiting malicious sites. The ML classifier strongly indicates malicious intent.

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=ca+ipcc+gst+book+pdf+free
    • http://files.bingludu.com/uploads/1/3/1/4/131454012/talokeruge-luvopebira-repuporo.pdf
    • http://files.waldensamkite.com/uploads/1/3/1/4/131438759/3018119.pdf
    • http://files.theessendonhotel.com.au/uploads/1/3/0/9/130969402/1ab850799b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files/vevegesefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/daletojixorugosonofo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1256/files/33312660691.pdf
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/delixalekiporowagixoner.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5385/files/15117220537.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/zowojuleli.pdf
    • https://cdn.shopify.com/s/files/1/0432/2610/3971/files/katuzunoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/ashram_shala_sanhita.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/45053197931.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/26935382617.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4733/files/32669872734.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3767/files/jokutezekevesagaranovibub.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/handbook_of_alcoholic_beverages.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_off00006062.bin
769d6e19ff598bf1a24c232f82818f8797fc0aeb58bcf8d9948ca79fbbdd977b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6062 5400 bytes
font_01_sfnt_off000072c3.bin
be6104b379c04eef71860eba1cea2f6d6a482d97fee5f6be437e41ca1944c238
pdf-font-stream PDF embedded font (sfnt) at offset 0x72C3 10420 bytes