Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c4740d51f20c72…

MALICIOUS

PDF

44.6 KB Created: 2020-08-07 00:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b992e78a6543011ec530766718495bdf SHA-1: e1d4c40f388ea36ff27ed3d456500765cadfc741 SHA-256: 82c4740d51f20c7240811ceed41e618fbc39d02dee2aecd42beca53213043400
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to a link farm designed to manipulate search engine results. One of the primary links directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a tutorial, likely a lure to encourage clicks on the malicious links. No scripts were extracted, but the presence of numerous external links and a malicious redirector strongly suggests a phishing or content-scraping attack.

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=assembly+drawing+tutorial+pdf
    • http://files.wppsfete.com.au/uploads/1/3/1/1/131164473/dumemokusipo.pdf
    • http://files.woodworkslexington.com/uploads/1/3/2/7/132710783/0ab6400d5af9a0.pdf
    • http://files.mareadingcouncil.com/uploads/1/3/1/8/131871643/dufudobaxil.pdf
    • http://files.forumbooksshop.com/uploads/1/3/1/3/131379213/1800e7ad9442.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/3383/5173/files/jilegukerolivepiwulon.pdf
    • https://cdn.shopify.com/s/files/1/0433/4184/0552/files/java_download_file_from_server.pdf
    • https://cdn.shopify.com/s/files/1/0437/9118/8117/files/dakenikebelajaxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4325/0588/files/jojar.pdf
    • https://cdn.shopify.com/s/files/1/0437/7912/9501/files/kaxazasidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9177/8965/files/gejefagu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/58039930469.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/wiped.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/adobe_flash_cs5._5_serial_number.pdf
    • https://cdn.shopify.com/s/files/1/0434/4938/5126/files/1278908381.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/mekofimigud.pdf
    • https://cdn.shopify.com/s/files/1/0431/5394/8836/files/53672517598.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_off000062b0.bin
b28eb2869cf876028a3968452c995923a3310b8eaeda565e649f4aaf8f096df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B0 5564 bytes
font_01_sfnt_off0000758f.bin
814202750a22eb69f357222ef641ef966b999422430fb46232b4b1420549ff04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758F 9972 bytes
font_02_sfnt_off0000976a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x976A 4324 bytes

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