Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caea69221e66393…

MALICIOUS

PDF

43.2 KB Created: 2020-09-01 15:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a5d7c1d35b448331cef9cc027e0ba9 SHA-1: f7da3f9a152f953112b22c8356543fe25f5a48e1 SHA-256: 6caea69221e66393145668a9e063471ae85b1ebbd0fd8a7aa464880cdd46522d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'Android emulator software for pc free'. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=android+emulator+software+for+pc+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0461/9416/3863/files/bharat_chashni_song_mr_jatt.pdf
    • https://cdn.shopify.com/s/files/1/0431/4818/1666/files/85953550670.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/zeditudebivomofura.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/wotakimokefixa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/20071286777.pdf
    • https://cdn.shopify.com/s/files/1/0428/0641/1431/files/argumentative_essay_format_apa.pdf
    • https://cdn.shopify.com/s/files/1/0435/9723/4338/files/the_prayer_of_jabez_bible_study.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/story_of_christianity_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0463/0727/9013/files/tanker_safety_guide_liquefied_gas_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0559/files/22839553950.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevedizulav.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_off00006ae2.bin
1dca92248a8caf6594bcf8cfd6a3b410852de5f43d6a0cd8aad0407742b61d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE2 5384 bytes
font_01_sfnt_off00007d2b.bin
5382d7faa8ec2b2a93194dbefebbb65f43d493dc2146824150ee46c6869478cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2B 10196 bytes

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