Malicious PDF — malware analysis report

Static analysis result for SHA-256 709cc4cfb1c160c3…

MALICIOUS

PDF

48.4 KB Created: 2020-07-26 12:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 445d316042656f3f1d01678cfb0e6c9a SHA-1: e869e8b7e8f3e6d2fd257d3c4270c6ea1a03d4a4 SHA-256: 709cc4cfb1c160c3eb5484fc496e335bbca6affcf1a5dc1e52b4fe74b1328d91
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, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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=audacity+manuale+italiano
    • http://files.woodyshticks.com/uploads/1/3/1/3/131379612/ritozo_luwubuvilul_bizifodoli.pdf
    • http://files.reillycyclingtours.com/uploads/1/3/1/4/131438323/suratisagipuzepis.pdf
    • http://files.advanceprolighting.com/uploads/1/3/1/3/131383760/kevofuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6985/6158/files/benudevuxirobiwokunogen.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/lebedudon.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6117/files/dasilo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/xebuzoledo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/poxetapidosipa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/24525613103.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/nagef.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/rexoletasezoloxilugex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexivopagutufaxusezonav.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/getobifur.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7475/files/4463178370.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/10024563332.pdf
    • https://cdn.shopify.com/s/files/1/0431/3323/9457/files/37675105241.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_off00008227.bin
df6738d79ca0a2f67c2814784937bc694377b41cb52a02f4c9f268937e7522de
pdf-font-stream PDF embedded font (sfnt) at offset 0x8227 4784 bytes
font_01_sfnt_off00009257.bin
24a85ed2b108e527c6b0d9b089cc6bab77a0396e6d17f224f1109d795c34fa20
pdf-font-stream PDF embedded font (sfnt) at offset 0x9257 10004 bytes