Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e91c07d172eea60…

MALICIOUS

PDF

37.7 KB Created: 2020-08-08 01:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f19d9c79845bb035ee94790290cba51d SHA-1: 4b9d8ccad3302219fe8b772db5bd44aba309ce21 SHA-256: 5e91c07d172eea606769f6177d565a0e622c8a6a3ea9fedc2b683e06222946f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.ru/pify?keyword=precalculus+with+limits+a+graphing+approach+3rd+edition+pdf, which is likely part of a SEO poisoning campaign to lure victims. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=precalculus+with+limits+a+graphing+approach+3rd+edition+pdf
    • http://files.newmillerdam.info/uploads/1/3/1/4/131406736/4881393.pdf
    • http://files.twinlightshome.com/uploads/1/3/0/7/130776735/bisezejewu.pdf
    • http://files.thevisualnarrative.com/uploads/1/3/2/8/132816195/35b5a524e38.pdf
    • http://files.livewithmimi.com/uploads/1/3/1/4/131453143/dalowukup_gejinedevubamix_lawukafomunob_todumit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0962/1665/files/jabofodufol.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/lirilefem.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/afcat_previous_year_question_paper_with_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/guwotexanamegajujubip.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3907/files/toturovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/ximatapajolozorosefit.pdf
    • https://cdn.shopify.com/s/files/1/0433/7175/7718/files/pixibafovebupubi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9757/0980/files/fusugajemifesutibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/62519347804.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8246/files/analyse_medicale_biochimie.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/rijef.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/6981/files/dofaje.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_off00005890.bin
bb801d94b84f238b2c362be38c34ae721dcb05721e5e63e424f7bbed0d6eaee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5890 5824 bytes
font_01_sfnt_off00006c4e.bin
89585ba951d7da61cb74f837bc5047e1eaa5969b8b3caa5f470bf4124e5ca258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4E 8484 bytes

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