Malicious PDF — malware analysis report

Static analysis result for SHA-256 9903de4fbf434d05…

MALICIOUS

PDF

35.4 KB Created: 2020-08-17 15:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f99847391caf6e9b11d128b0ae4c01a SHA-1: c79d66703800a038dc223d987af6828e4ac5a7e1 SHA-256: 9903de4fbf434d0585887336b8ae113eee9497bc0eaa227bfb2f27a25496d5fc
152 Risk Score

Malware Insights

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

The PDF file contains a deceptive document title and numerous embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.com/pify?keyword=docs+spreadsheet+header. This suggests a phishing or social engineering attempt to redirect users to malicious 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=docs+spreadsheet+header
    • http://files.sweetcheeksphotog.com/uploads/1/3/1/4/131453749/meron.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8444/files/wonefejizede.pdf
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/doletu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5759/files/kobepik.pdf
    • https://cdn.shopify.com/s/files/1/0446/9784/5913/files/promissory_note_texas.pdf
    • https://cdn.shopify.com/s/files/1/0435/7259/2801/files/26767536227.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/josuzafegeda.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5879/files/iacopone_da_todi_laude.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/92160703667.pdf
    • https://cdn.shopify.com/s/files/1/0431/0689/3985/files/apache_tomcat_for_windows_8.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6600/files/action_research_theory.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7650/files/noxedupuzosi.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_off00004da5.bin
53dad51f01aff42101eec01f6f2102076f3ca1f01efcd59099b945b617c5239e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA5 5128 bytes
font_01_sfnt_off00005f06.bin
2a10482872795224c3b64a19e22286a0da41041e2ca21a4d09360e88f2a10664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F06 10012 bytes

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