Malicious PDF — malware analysis report

Static analysis result for SHA-256 632d377a6760aaab…

MALICIOUS

PDF

37.3 KB Created: 2020-08-13 00:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52f572e5244f885d7cca9453a67ec25f SHA-1: 30e734746e8d37976d75010da0258fd88ed96151 SHA-256: 632d377a6760aaab9621921714e4c92b897f287412859b9d04f6dd8042eeaaeb
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate content, specifically a 'Baroque architecture book pdf'. This link redirects to a malicious URL, indicating a phishing or scam attempt. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded URLs and the heuristic firings are sufficient to assess the attack pattern.

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=baroque+architecture+book+pdf
    • http://files.aznutritiononline.com/uploads/1/3/1/6/131606165/9950916.pdf
    • http://kelebi.stresswiseatwork.com/uploads/1/3/0/8/130874620/4280615.pdf
    • http://sazixoked.skylarkpubl.com/uploads/1/3/1/3/131379206/1291405.pdf
    • http://files.kpcdesign.org/uploads/1/3/2/6/132695418/71044.pdf
    • http://files.creativeiceskating.com/uploads/1/3/1/3/131380032/790a473bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7738/5892/files/bojobakufifosikelarut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zukukujumifuxutage.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.pdf
    • https://cdn.shopify.com/s/files/1/0435/4008/6935/files/25121275290.pdf
    • https://cdn.shopify.com/s/files/1/0432/1257/0783/files/dazokavivagipurigi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/96174521213.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/2416052240.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/gugorilemuku.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/categories_of_computer.pdf
    • https://cdn.shopify.com/s/files/1/0435/8271/8107/files/95425933652.pdf
    • https://cdn.shopify.com/s/files/1/0434/4990/9415/files/45150001927.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1365/files/generac_22kw_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/67534421493.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_off0000523b.bin
8b21b043d6cc89d8e1cf9304d5e73c253825f66142e14b083c22c47b86354695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x523B 5412 bytes
font_01_sfnt_off00006497.bin
ed96e45dd3cf945fa124d4a3268f16d835611b1e0f305822dd7ec7002011a593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6497 10368 bytes

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