Malicious PDF — malware analysis report

Static analysis result for SHA-256 113bd0c1b7ad9daa…

MALICIOUS

PDF

41.0 KB Created: 2020-08-24 20:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb8ecd5cdeb803d1989932b4a598148 SHA-1: 490bfced38ad507b60652ccecfad931b7a23d64c SHA-256: 113bd0c1b7ad9daa4a72e52b53de5b507ff8b7a037d31895ac1c37958a41e5bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.com/pify?keyword=layers+of+the+earth+worksheet%2523+2+answers', is designed to lure users into clicking it. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse.

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=layers+of+the+earth+worksheet%2523+2+answers
    • http://files.drstephanisko.com/uploads/1/3/1/4/131437987/89886f.pdf
    • http://files.angelamedinagarcia.com/uploads/1/3/1/3/131398479/jasoti.pdf
    • http://files.nvhstheatre.com/uploads/1/3/0/7/130740213/9982865.pdf
    • http://lisilemij.stjohntheevangelistcarrollton.com/uploads/1/3/0/7/130739922/7503164.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7259/3821/files/jquery_auto_submit_form_on_select_change.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/alphabet_handwriting_practice_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0459/6747/4855/files/77230510216.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/tovasefimovon.pdf
    • https://cdn.shopify.com/s/files/1/0436/7941/6473/files/rise_origa_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0462/0366/6582/files/avg_tuneup_unlimited.pdf
    • https://cdn.shopify.com/s/files/1/0465/5785/5894/files/microsoft_toolkit_to_activate_office_2013.pdf
    • https://cdn.shopify.com/s/files/1/0432/9511/3374/files/gakamefezowubarujezave.pdf
    • https://cdn.shopify.com/s/files/1/0437/9050/0001/files/evidence_chain_of_custody.pdf
    • https://cdn.shopify.com/s/files/1/0430/8097/4490/files/sovigokawavebeda.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9208/files/51687812853.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/24230477727.pdf
    • https://cdn.shopify.com/s/files/1/0447/2566/5945/files/drz400_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3882/files/ropegawuna.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/thani_oruvan_hd_movies.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_off000062fd.bin
e6e76478f89b6ad7e195ee98cb002cd0a92e11d8fbbb005e71a230268b3dda98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FD 5024 bytes
font_01_sfnt_off0000742c.bin
4c9273aaa3700cf3bd866ae5d410a4a91e39e39fc254c0ad20f33cf62a079375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 10132 bytes

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