Malicious PDF — malware analysis report

Static analysis result for SHA-256 3443eb7a6964da28…

MALICIOUS

PDF

49.2 KB Created: 2020-07-30 16:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd8249a0e3a8d4cfb3272f9272453d1d SHA-1: 895cbe5f70c14e3e0bae72544db4c67f7e5b8ef2 SHA-256: 3443eb7a6964da281e02f1dc5085816f3faf9eba542577abedf20377f2e0ad90
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including a known malicious redirector and algorithmically generated URLs pointing to other PDFs. The ML classifier strongly indicates maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest a campaign to distribute further malicious content, likely through deceptive search results or phishing lures.

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=anna+karenina+pdf+azerbaycan+dilinde
    • http://files.theweightlossshow.com/uploads/1/3/0/7/130775402/3f3344a789d9.pdf
    • http://files.demellovineyardsthirdhillwinery.com/uploads/1/3/0/9/130969562/428195e6fcbc7dc.pdf
    • http://files.annepwert.com/uploads/1/3/0/7/130739311/6123099.pdf
    • http://files.harveyaraton.com/uploads/1/3/1/3/131380756/xapoxemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1310/4035/files/mopisonenukuxexulavumet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/48016759837.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/redukenedobitaguwowok.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/39054638367.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/94507784667.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/nifebadixibek.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/wupibunepomovixujizazaka.pdf
    • https://cdn.shopify.com/s/files/1/0433/9721/8460/files/toduwobi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4130/files/13654959794.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_off000083e3.bin
1dfb76b61dd5081d73b5e6198d6eca06002966dac61255cd9f194631a007d9d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E3 4912 bytes
font_01_sfnt_off000094a0.bin
32926c08fcb2688a87ba075c2bbcaeedb4fab1c9ea34bdb1e47cdd644a1b1e4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A0 10108 bytes

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