Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41e62945d7e4dce…

MALICIOUS

PDF

37.6 KB Created: 2020-08-13 05:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f52cb9d8cec600cde1af13c2f75fa442 SHA-1: a16ec83a20a59e3237173bba0fa1b1670812ade6 SHA-256: c41e62945d7e4dcedfeab2a011c2a5a7598c0d74c970eb02a5247de45949f291
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body text, though partially corrupted, includes the phrase 'Free pdf editor download' and a URL that matches the malicious redirector, indicating a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

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=free%20pdf%20editor%20download
    • http://files.whatshouldmykidsread.com/uploads/1/3/0/7/130776449/6682677.pdf
    • http://files.slickpackages.ca/uploads/1/3/0/7/130776558/kamovudatumijudepa.pdf
    • http://files.organichead2toe.com/uploads/1/3/2/7/132710679/lujusagifavevege.pdf
    • http://files.rehabcapetown.com/uploads/1/3/0/8/130815228/8286408.pdf
    • http://files.advancedenergywork.com/uploads/1/3/1/3/131381078/gawafebisosop_vowofi_fifob_vifuruxafak.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/32882087139.pdf
    • https://cdn.shopify.com/s/files/1/0432/1804/3040/files/modosuwuvaxapovewabebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6576/0151/files/jexuzolakakidu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0769/7305/files/tezarizekegug.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4311/files/82532113670.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0374/files/kupegukutogamekamugafajut.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/nutasifonikaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/towemixagonujevadutuxox.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/34156305992.pdf
    • https://cdn.shopify.com/s/files/1/0434/4096/3751/files/26321469646.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/gafafug.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/field_and_wave_electromagnetics_cheng.pdf
    • https://cdn.shopify.com/s/files/1/0429/1123/6259/files/23907516211.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_off00005721.bin
db77858c3417ec6e32a6515edb9604c5b05ccff1b0a82bb404867095951d8f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5721 4904 bytes
font_01_sfnt_off000067f0.bin
856f39a4cddc255b87140e113cbf2fc84628a30b294bc26a5ccc3b450822c19e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F0 9896 bytes

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