Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea60dd7c5ac905f…

MALICIOUS

PDF

38.7 KB Created: 2020-08-18 21:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e767ace60aa6ef398238f3f11bd1043e SHA-1: 7b8b29175ccf66de41399c4d8427d526fb9bcd68 SHA-256: 4ea60dd7c5ac905f8166157674ef260607c3b72c2039a37ac4c85c4e5e0f6fd5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a worksheet. This redirector is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same lure text and the malicious URL, reinforcing the phishing attempt. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=maths+similar+shapes+worksheet
    • http://files.earthseaspacemuseum.org/uploads/1/3/1/4/131454791/turegonuwemam.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8775/files/zimoxepovolepajid.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/9596676067.pdf
    • https://cdn.shopify.com/s/files/1/0436/1594/4867/files/49901696986.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/dizagupidipuliwumuwafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8526/files/fepukegekuxazewew.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4396/files/14301562604.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/dufidolenuvigamijenelejez.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/duzazudifixe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a76.bin
6d3c5b1a6b15c3e2c377ad3f3829162769f1f1fbe6f690fef9fc0948ca4a5eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A76 5220 bytes
font_01_sfnt_off00006c29.bin
53c7bd6f0da71381418bdbe5c44bbc986b5bcc7b8967926d39a6023b6f9f837c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C29 10144 bytes

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