Malicious PDF — malware analysis report

Static analysis result for SHA-256 189d20f516d6dbb6…

MALICIOUS

PDF

49.1 KB Created: 2020-08-22 00:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43229ac2b628d4bab243aca54f3b52a2 SHA-1: a3b5f9ca2c5da38783a75d2c57494b0e660730e9 SHA-256: 189d20f516d6dbb6c8ee06426796a0561dda6ab80412c9a0893d3eab08dcdad5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. This suggests an attempt to direct users to malicious sites under the guise of providing information.

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.ru/pify?keyword=society+of+critical+care+medicine+delirium+guidelines
    • http://files.charlietaylorphotography.com/uploads/1/3/0/7/130775543/mebesizisivedu-rexegegedisemol.pdf
    • http://files.streetfootballwales.com/uploads/1/3/0/8/130813095/7864272.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/2614/3639/files/adding_subtracting_multiplying_decimals_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/slide_ppt_gratis_lucu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/47392750891.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/dolovironofumokuwapoxub.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/vemulaselad.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/avant_garde_theatre.pdf
    • https://cdn.shopify.com/s/files/1/0435/3546/6655/files/centroid_and_centre_of_gravity.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3355/files/pathophysiology_of_arterial_hypertension.pdf
    • https://cdn.shopify.com/s/files/1/0446/8090/4857/files/39441445950.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8730/files/97222369441.pdf
    • https://cdn.shopify.com/s/files/1/0435/5011/3943/files/dilemma_of_a_ghost_themes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066cd.bin
89fad270a68c4a5c333a39096603852cdb52f5745c7b441d19507732ff5715a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CD 5428 bytes
font_01_sfnt_off0000791a.bin
398297ddb5a1ec551ca0c8ab42de9c684716114ff8504afa52770c18101d9381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791A 14684 bytes
font_02_sfnt_off0000a6f1.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6F1 4324 bytes

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