Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7ca4a40a27f35e…

MALICIOUS

PDF

44.9 KB Created: 2020-08-10 05:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71103e0ad60e5ab24e79c8bfbacce263 SHA-1: 726a1a2f5fd764f88a9c8854e67461ae074f1dce SHA-256: 6c7ca4a40a27f35e47b65a23e2a61ce66ded9cd47c1f950443c2de514be3d4ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The document body, though partially obfuscated, contains a URL that is also present in the list of embedded links, reinforcing the malicious intent.

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=difference+between+phoneme+and+allophone+pdf
    • http://sameg.gempatentservices.com/uploads/1/3/2/3/132302963/ranuperanur.pdf
    • http://binerixiv.tyhallmark.com/uploads/1/3/0/9/130969723/nerubebema-mavefoxedut-finofap.pdf
    • http://files.1000booksfor.org/uploads/1/3/0/7/130740483/mogurobusebomovez.pdf
    • http://files.mainesummerar.com/uploads/1/3/0/8/130814754/6787464.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/bosumidusewanuzarulefute.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2193/files/jujawe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/6756580193.pdf
    • https://cdn.shopify.com/s/files/1/0441/1500/1496/files/21156284906.pdf
    • https://cdn.shopify.com/s/files/1/0433/8574/9665/files/gewetemam.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6695/files/antonyms_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/bepigejudifidosegeko.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/narijejilelejusugokonowu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1815/6192/files/apollo_13_movie_questions_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4524/files/hit_em_up_instrumental.pdf
    • https://cdn.shopify.com/s/files/1/0439/0230/4408/files/nuwawomorenerawibemonime.pdf
    • https://cdn.shopify.com/s/files/1/0441/3197/5320/files/7392795542.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_off00006fbb.bin
b367235e49b532cbd010451bc65d06547508524e74c0c81e2ddfda7fd97336f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBB 5448 bytes
font_01_sfnt_off0000822b.bin
3ea222452f3eb089787ecb97756997d180b8a06a056d0987ea5c4c4d67b5a357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x822B 10732 bytes

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