Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f76140e9e1af6f…

MALICIOUS

PDF

40.3 KB Created: 2020-08-11 01:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b7d6668a10f9dd76558383bbdada5fd SHA-1: 483b833e2bb71b243fd11c0d8369364336bc89ec SHA-256: 01f76140e9e1af6fc669b26c47079b449a4e4ce8f7d792a492518fe804ab474a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=icici+bank+business+loan+application+form+pdf'. The document body, though partially garbled, also contains this URL, suggesting a lure related to 'icici bank business loan application'. The presence of multiple external PDF links, some algorithmically generated, indicates a link farm designed to distribute malicious content or facilitate phishing. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=icici+bank+business+loan+application+form+pdf
    • http://files.clintlovell.com/uploads/1/3/0/7/130738562/4404206.pdf
    • http://files.emilyjsowerby.com/uploads/1/3/2/6/132681851/woman.pdf
    • http://files.capecodspeechlanguagepathologists.com/uploads/1/3/0/7/130740011/terel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6628/5480/files/vaxoretejewabefavuku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/the_respect_principle_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/dapejanod.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/togurozefuvogugatudibav.pdf
    • https://cdn.shopify.com/s/files/1/0437/3194/3585/files/48242323787.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/49861622761.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/wavibazanupifebo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6348/files/auditor_general_report_petrojam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/jumosukozutaranafupon.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3081/files/gezijoxidepiwesijovij.pdf
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/hs_code_malaysia_2020_sst.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fba.bin
3187fc9f61f7751f89c9a23db603b4aede2ecaa1df4e6ea4ff57a449abefe8f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBA 5440 bytes
font_01_sfnt_off00007218.bin
b5b20816ef6d620bee6faef6b971d7320d41fd16892691f750f35bbbbb22986f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7218 10016 bytes

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