Malicious PDF — malware analysis report

Static analysis result for SHA-256 174ea8657c59e4cb…

MALICIOUS

PDF

45.8 KB Created: 2020-08-02 03:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 425462d9702b5f8aeb47d7df6600987e SHA-1: b333a199d843949ecee189e16b5642558478fed0 SHA-256: 174ea8657c59e4cb80670ed5c832f39c2e5860870749e2d7e3e56c7c6baca581
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with 17 external PDF links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the document is designed to trick 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.ru/pify?keyword=weather+moscow+idaho
    • http://files.portaverdestudio.com/uploads/1/3/1/4/131406092/2300797.pdf
    • http://files.missiowaresourceportal.com/uploads/1/3/1/3/131398008/1318821813383.pdf
    • http://files.margaretwebblifecoach.com/uploads/1/3/1/6/131606411/8997556.pdf
    • http://files.cccjac.org/uploads/1/3/1/0/131070911/todafu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/1960_chevy_bel_air.pdf
    • https://cdn.shopify.com/s/files/1/0431/7134/8641/files/vovirufonakevakaxokutu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/ruwizunaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/50575152691.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/e6_98_a5_e8_8a_82.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/9106759489.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/suzujakimi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7232/3737/files/vitenatuvorizi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5239/files/kasitilodivajidiki.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/94324145328.pdf
    • https://cdn.shopify.com/s/files/1/0429/3342/0195/files/vefana.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_off00007554.bin
431f5af04539a05c8ea13661ad015693236c3da5778744b32279252d0c5c1211
pdf-font-stream PDF embedded font (sfnt) at offset 0x7554 5252 bytes
font_01_sfnt_off0000871a.bin
ab11e26ccc89ed8d41cc5082f9d88e4869bd0ffa7a5d6a5be93f3d0140bfc0a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x871A 10272 bytes