Malicious PDF — malware analysis report

Static analysis result for SHA-256 1366a114593e5df9…

MALICIOUS

PDF

46.2 KB Created: 2020-08-28 08:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1339d7032b2f873322f504e38f54ed89 SHA-1: e35df1d7b77d93851e0218c41ca670ec72927884 SHA-256: 1366a114593e5df99c9fe57f15a4de40154be3f63357dcc830b661abbd3121d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to distribute SEO-optimized PDFs. One of the primary links directs to a known malicious redirector, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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=azucares+reductores+en+heces+negativ
    • http://gazol.conniecycling.com/uploads/1/3/1/4/131454950/direwokog_zemajipo_gewilazedi.pdf
    • http://nopop.gracechurch-pcusa.com/uploads/1/3/0/9/130969335/40db6b7f5e6526.pdf
    • http://files.siblingsandcompany.com/uploads/1/3/0/9/130969237/judeluvukamoji.pdf
    • http://files.psproofreading.com/uploads/1/3/2/7/132740637/vizopetegoru-balugaw-puxirawupe-dusizokuz.pdf
    • http://files.eullallia.com/uploads/1/3/1/1/131164129/580288.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9240/1558/files/rational_functions_asymptotes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0427/4618/3847/files/zavokasitufipun.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/agile_scrum_master_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9446/5948/files/central_time_to_east_africa_time.pdf
    • https://cdn.shopify.com/s/files/1/0438/5597/0454/files/23575341015.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0213/files/accounting_words_and_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1715/files/77357244225.pdf
    • https://cdn.shopify.com/s/files/1/0436/1483/0749/files/51074072673.pdf
    • https://cdn.shopify.com/s/files/1/0458/2673/6291/files/kanewepugaga.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/5062926047.pdf
    • https://cdn.shopify.com/s/files/1/0448/8495/1207/files/ejercicios_para_abdominales.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/get_credit_report_ireland.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_off000072eb.bin
a6aaf05813ef5abfb996528ee0e31c56943ed1d3ae19a5d498f033bdc8891c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EB 5268 bytes
font_01_sfnt_off000084d7.bin
903b9026a9ce2134ce223b4688e4295b8d92139164eb7729b4ab2eb529543379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D7 11616 bytes

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