Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea0898692d1942d…

MALICIOUS

PDF

41.2 KB Created: 2020-08-19 13:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0d67b9f303520b5abee93c72cb6b393 SHA-1: 08b157131ded4b54434f3426e31e941b5e34474d SHA-256: 5ea0898692d1942d4e8b8af6b2424605af266c55fd0d5c47222fa81ce68bd835
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to a redirector service (ttraff.ru) or are algorithmically generated. The primary purpose appears to be SEO link farming, likely to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to lure users to potentially harmful sites.

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.ru/pify?keyword=thermal+insulation+sheet+home+depot
    • http://vesatize.waiaholenurserygardenandfloralgifts.com/uploads/1/3/2/6/132695675/xixezegoraputu_vudafol_fediza_xanubozore.pdf
    • http://files.jmbmoldings.com/uploads/1/3/1/4/131408117/79309.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/78488544627.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/34858805189.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/kowixufejem.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/94309203686.pdf
    • https://cdn.shopify.com/s/files/1/0448/5795/0370/files/arquitectura_sostenible_lexus.pdf
    • https://cdn.shopify.com/s/files/1/0430/8438/2357/files/cat_3412_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7964/6878/files/convert_language_arabic_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1621/files/center_placeholder_text.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/bijakanevisera.pdf
    • https://cdn.shopify.com/s/files/1/0435/5630/7107/files/miss_universe_2011_question_answer_top_5.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/zebezowugipowidusidij.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4835/files/50490971025.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_off00005911.bin
16198fb29ca8737bd6c295d13a4353525fdd4dac713139d1ece413e68b42064e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5911 5148 bytes
font_01_sfnt_off00006a63.bin
31e2e9fac2e15bde9825a19022295e3d550cdced05bdc5f627216a9b62c11b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A63 14568 bytes

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