Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fb43d5c036ecbe…

MALICIOUS

PDF

48.8 KB Created: 2020-09-05 21:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a66505af96c6d7563c58d1112971cd3a SHA-1: d04e1c0e78bf935905f2c9d9d7bb0f363e22f9c8 SHA-256: b7fb43d5c036ecbe61de47d321a8c4c454b4f6cbd6e740ef1858181b2f974edc
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to 'facebook lite marketplace apk'. The ML classifier and heuristic firings strongly indicate malicious intent. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic.

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.club/pify?keyword=facebook+lite+marketplace+apk In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5249/9098/files/html_css_bootstrap_form_templates.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/pividifuvasudasowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0292/9047/files/nuxowesojowelexonixuzudux.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9ec29b_fb2810e92fd34009bb8d08f497f21b25.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6924eb_14392696234b49b6a5039429f9c82955.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eb6612_ea2cad9e02644f168bc71ba01c732370.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8ff694_14f6a3b22bcb49359969aed3778c69f7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b48b60_6fc9435819d24a58865e6696bf8c3d53.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/824332_ec4c5a03bbee4927b5d510f3984f2394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7840/1700/files/gmu_neuroscience_advising_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4962/1406/files/because_he_lives_hymn.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000650c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650C 4740 bytes
SHA-256: 29eab02a7776f2a2cd08464678cfa8bd12beca1b1aeeae7b288e807e80b99cd9
font_01_sfnt_off0000751c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x751C 1964 bytes
SHA-256: 3974e200c5d9c8f30123e1eac38fa50876741fee3be316e840f85b529713d3bf
font_02_sfnt_off00007e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E28 13056 bytes
SHA-256: 17d18322e725f2ae649ace37010dedec6b473286750d351ff42aa1391ecf22fd
font_03_sfnt_off0000a7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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