Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8161aeece26701…

MALICIOUS

PDF

36.4 KB Created: 2020-08-15 10:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18fee58267e4aa299ef7dc4e6acc24fc SHA-1: f2d7be98313094fa58600f7a61c4b60559e51e32 SHA-256: 9f8161aeece267011a7da727ec0fa7c4a0430909aa4334546fc8c1470e082d7a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link to a redirector service, which is flagged as malicious. The document body text, though garbled, includes the phrase 'Used unlocked android smartphones for sale' and the malicious URL, suggesting a lure for a phishing or scam operation. The presence of numerous other links to Shopify-hosted PDFs indicates a link farm strategy to potentially improve search engine ranking or distribute content.

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=used+unlocked+android+smartphones+for+sale
    • http://wukegaga.uncamwho.org/uploads/1/3/1/4/131407705/9502617.pdf
    • http://files.halediainc.com/uploads/1/3/2/6/132681812/tazonekenigodak.pdf
    • http://files.knuckleswhiterock.com/uploads/1/3/1/8/131856247/koteruzujidimu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0111/6833/files/4500745382.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/71729206993.pdf
    • https://cdn.shopify.com/s/files/1/0429/1638/0831/files/17578481259.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/corpus_christi_doppler_radar.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/repiwarufojizedo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0590/1991/files/86666525000.pdf
    • https://cdn.shopify.com/s/files/1/0435/8507/7405/files/dafujejuzimokanudosavewu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0660/5987/files/47506167506.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/84382602273.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004493.bin
6cd0721c6790069617f6c1d2cd2001ec7ca3ac31e0914a5a409cf1cad01f09a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4493 5332 bytes
font_01_sfnt_off00005681.bin
a47b5624a642fd99a85b881fca5a74c8190ee0b16e434649b194b92506fd29f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5681 9588 bytes
font_02_sfnt_off000076c3.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C3 4324 bytes