Malicious PDF — malware analysis report

Static analysis result for SHA-256 4034629e0b1f3334…

MALICIOUS

PDF

67.1 KB Created: 2020-08-20 23:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 372738fe2e1ce05982a91f6e9e5b72d0 SHA-1: 0b4ac54d40f97df4b96acb80a607a3aabf47b381 SHA-256: 4034629e0b1f3334ec921d6bacf700c6ee4f8c317a68c8ebd1f0bd2914b45aae
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a high number of embedded links, many of which are part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=assamese+alphabet+song'. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure. The presence of numerous links, including those pointing to potentially malicious redirectors, indicates a likely phishing or scam attempt.

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=assamese+alphabet+song
    • http://tojosizal.asproengineering.com/uploads/1/3/1/4/131482993/6085437.pdf
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/38697182129.pdf
    • https://cdn.shopify.com/s/files/1/0434/5934/6582/files/mijuwabikitujineser.pdf
    • https://cdn.shopify.com/s/files/1/0439/5443/8302/files/speedy_eggbert_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/90978474026.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/75213963301.pdf
    • https://cdn.shopify.com/s/files/1/0445/7899/6383/files/begat_the_king_james_bible_and_the_english_language.pdf
    • https://cdn.shopify.com/s/files/1/0435/2684/8661/files/cms_1500_form_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/90352178449.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/segegewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/10548490913.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/xubafobejoxuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/39378747264.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a3e.bin
44b3102928d05cb0b33c9078e90bae9e96d0a9f2823c9dabd8d3c296fca69c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3E 5004 bytes
font_01_sfnt_off0000ab13.bin
4b41010cf428c6ba75de14463bbe0d90bdbacdf674bf179a74817bee4be2fc01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB13 7336 bytes
font_02_sfnt_off0000c2ce.bin
5cbe0b503ff93399dc554a75d37367b092614e53d2b7e1a85d30fd0fc6f93bbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CE 14840 bytes
font_03_sfnt_off0000f0f2.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 4324 bytes

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