Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d150540c895eb14…

MALICIOUS

PDF

47.1 KB Created: 2020-07-20 05:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e611f1d5f5b50ec18ccca54437d365f7 SHA-1: c006134a1d1ccfc3993eff4c1f38efc28c17b36c SHA-256: 1d150540c895eb147a70dfa844e83e9dd58b20a7d1c8383ab59b29c741a02a21
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs that point to a link farm, indicating a malicious intent to redirect users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its lure, but the link farm is sufficient evidence of a malicious redirection attack.

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/wb?keyword=pdfsharp%20invoice%20sample
    • http://files.valleyharvestmarathon.ca/uploads/1/3/1/4/131407665/d94f427ef63b22.pdf
    • http://files.dowhatyoulovenyc.com/uploads/1/3/2/6/132682739/2a11a.pdf
    • http://files.travelingnurses1.com/uploads/1/3/1/4/131438471/2017e.pdf
    • http://files.muzideas.org/uploads/1/3/2/6/132681336/d0d3924a1e.pdf
    • http://files.ljubaavvakumova.com/uploads/1/3/2/7/132740637/duwigol-fuwojofakek-wabedokatu-duwinu.pdf
    • http://files.marzipan-media.com/uploads/1/3/1/8/131856184/7584706.pdf
    • http://files.stefanobazzano.com/uploads/1/3/0/7/130776069/pegutawoxibojov-gosikirematolij.pdf
    • http://files.mathgrub.com/uploads/1/3/2/8/132814624/dotetini.pdf
    • http://files.tandesoleilmorrobay.com/uploads/1/3/0/7/130775655/pumagesive.pdf
    • http://files.schonestandardschnauzer.com/uploads/1/3/1/3/131398000/zuremuze.pdf
    • https://bokisutedex.files.wordpress.com/2020/06/56648395281.pdf
    • https://jefukuvanowi.files.wordpress.com/2020/07/32153552799.pdf
    • https://motifomimiwa.files.wordpress.com/2020/06/vojazutebup.pdf
    • https://duwopizemole.files.wordpress.com/2020/06/24239474504.pdf
    • https://sekojejun.files.wordpress.com/2020/07/20865827867.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/84388188104.pdf
    • https://cdn.shopify.com/s/files/1/0429/5298/2684/files/51622274825.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/42493207298.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/25165477376.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1726/files/xerukujuru.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/kusazuzijekolabibupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.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_off00007b69.bin
0c2e86c68619b2b432d7083abc4dc4d3523f4ec89bfefbf3bd73bf640ec422b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B69 5164 bytes
font_01_sfnt_off00008cc2.bin
05927f341bda7589da069c101247c524af6a3e4a3df4a7e1bdce9a63825e408c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC2 10116 bytes

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