Malicious PDF — malware analysis report

Static analysis result for SHA-256 84390f5974dd2ecf…

MALICIOUS

PDF

40.1 KB Created: 2020-08-28 12:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9082f72fd45fdde5832deae0af75c35 SHA-1: 13a8220f1f818f0b5c30eb474f62948f64e98351 SHA-256: 84390f5974dd2ecf4d2a990a74738c1a692a099528d3dc372922589893eaef5b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or malware distribution.

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=jacques+salome+carti+pdf
    • http://files.homerindex.com/uploads/1/3/0/7/130775046/sujadusom-rorabivapi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/blessed_be_your_name_music_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/lagevipuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/13564062525.pdf
    • https://cdn.shopify.com/s/files/1/0432/4360/2080/files/what_is_mcdonaldization.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2650/files/52606930914.pdf
    • https://cdn.shopify.com/s/files/1/0440/5549/4806/files/discrete_wavelet_transform_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/7711/5810/files/sezojomigaliwulawatovopix.pdf
    • https://cdn.shopify.com/s/files/1/0431/8933/8276/files/mobajepapetoxofeput.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/51512692752.pdf
    • https://cdn.shopify.com/s/files/1/0431/4290/6007/files/zejigaza.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_off00005e30.bin
483c5f2f0e2b1d0d731e984211c37e44cfa635e19dea20441790773f83fca916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E30 5416 bytes
font_01_sfnt_off00007081.bin
d43fe2b862cb3938b431c6bef0fe8beaca361b80f9a6869ea29af181413b5499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7081 10512 bytes

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