Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fe36b8a7c2731a…

MALICIOUS

PDF

57.1 KB Created: 2020-07-25 19:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f57f6cb7de2b0ea55605d74f381f9db SHA-1: 016eb6f7ec0c2775f11d4f1cade5452a65a30b9d SHA-256: 70fe36b8a7c2731aa682f5f3812917068d5b9dd78c369c33122fd505e2e31606
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, identified as a link farm, designed to redirect users to external sites. One such link points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the primary attack pattern involves redirecting users to potentially harmful content through a large number of embedded URLs.

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=blade+2+apk+data+rexdl
    • http://files.sanpedroleasing.com/uploads/1/3/2/6/132682142/tefewiwatuje.pdf
    • http://files.patchworkstories.net/uploads/1/3/1/1/131164198/kunewixegaxiv_jogud_jozovax_senojezak.pdf
    • http://files.theclevelandhike.com/uploads/1/3/2/7/132712514/67f66.pdf
    • http://files.svsoar.org/uploads/1/3/2/3/132303045/5869439.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/9783301654.pdf
    • https://cdn.shopify.com/s/files/1/0435/4008/6935/files/sogibofawakonerej.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/lerunexapasevomexewewowib.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0325/files/romoke.pdf
    • https://cdn.shopify.com/s/files/1/0436/4196/2649/files/talonovuwiralabolarozi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4925/5066/files/tizutizisotimixumawarize.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/furupokexopaxabisovijuwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/jekarolojupofiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/5577529669.pdf
    • https://cdn.shopify.com/s/files/1/0432/4740/3168/files/welax.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8932/files/43233127261.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/27183041534.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007875.bin
172c8ceef96d168779946e419f99482b8be511ea04b0cbdf7cc8bc9a0be9d4bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7875 4612 bytes
font_01_sfnt_off00008829.bin
3082de07fd256f04422ade5aef3bcaac390ee31e132b1638a78b9a6adcc083b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8829 4728 bytes
font_02_sfnt_off00009a46.bin
a917f83e3175e856bad6533fd8ed7d130073417db64bbc7278d12c43aa5a8efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A46 11852 bytes
font_03_sfnt_off0000c099.bin
d758c63dfff36cae03f42bae3bafd8a88df29cfa819cc463c23abab30afaad21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC099 16388 bytes

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