Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a85508e3ba65c3…

MALICIOUS

PDF

36.7 KB Created: 2020-08-21 19:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79056c16003d9a7815b3c83e14214333 SHA-1: c7c038e23e0491e96384574d91f91d9754253122 SHA-256: 67a85508e3ba65c3307faa9a7e574f39f280b22b8453e9fbe32962a30c709f88
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to host malicious content. One of the primary links directs to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the payload. The document body, though heavily obfuscated, contains text related to educational worksheets and includes the malicious URL, suggesting a lure to disguise 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.cc/pify?keyword=adding+decimal+numbers+worksheet+year+6
    • http://fetudila.creatingscience.org/uploads/1/3/0/8/130874090/finudevivav.pdf
    • http://files.getretti.com/uploads/1/3/2/6/132683330/9a8771dd.pdf
    • http://files.fitnessintrigue.com/uploads/1/3/0/7/130776208/tinevamaj_jadovunusug_lulakulizawa_zuziziji.pdf
    • http://files.onbradstreetfarm.com/uploads/1/3/1/4/131406412/28598c2e7.pdf
    • http://tosed.oursouldoors.com/uploads/1/3/1/6/131607000/8065223.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/28068496397.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/bruner_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4858/files/sy_bsc_microbiology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0434/1206/2364/files/58553466195.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/32694815045.pdf
    • https://cdn.shopify.com/s/files/1/0431/9602/2933/files/nowatibopowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/zejojudo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/convert_kindle_books_to.pdf
    • https://cdn.shopify.com/s/files/1/0451/1324/5848/files/importance_of_globalization_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/callese_y_venda_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/19964825179.pdf
    • https://cdn.shopify.com/s/files/1/0438/7618/8315/files/72108567599.pdf
    • https://cdn.shopify.com/s/files/1/0433/7480/5148/files/watch_the_avengers_2012_1080p.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/tovig.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_off00005134.bin
590ae831dc60818053a9b8335cf1fcb02059baab763f4a6c04d99dd8f9854461		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5134 5896 bytes
font_01_sfnt_off0000651c.bin
e3b2574a35f74db781485518988aac6eb51ce48d254e02b0ad25f728c6da65b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 9620 bytes

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