Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb52dd86fe6e81d…

MALICIOUS

PDF

49.3 KB Created: 2020-08-23 16:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 586c634da309ef0d915bd9063bc6862e SHA-1: 09e162aeed39135695268bfc7e700892e5a30af9 SHA-256: 0fb52dd86fe6e81d141cec2aa365d89a80d25798f3ac351ccdd40e3e7833994e
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 external PDF files, suggesting a link farm for SEO manipulation. One prominent URL, 'https://ttraff.cc/pify?keyword=office+maintenance+checklist+template+excel', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs indicates an attempt to direct users to potentially harmful content, likely as part of a phishing or scam campaign.

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=office+maintenance+checklist+template+excel
    • http://wuzor.lilianholm.com/uploads/1/3/1/3/131381045/8421934.pdf
    • http://files.dontmesswithcalifornia.com/uploads/1/3/1/4/131455158/lilelos.pdf
    • http://files.laurelweldon.com/uploads/1/3/1/6/131636758/e870cef856368d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/merezovibujuwu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4364/9698/files/40468989199.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/another_example_synonym.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/30569493318.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7495/files/xowubotukurowaluza.pdf
    • https://cdn.shopify.com/s/files/1/0437/9449/7698/files/java_programming_books_free_download_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/catalogo_jequiti_06_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/how_to_read_a_person_like_a_book_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/cetosis_ruminal.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/mupuwotidi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/pugipivitijopek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/degejuwetisagemudow.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1039/files/xaxosujoxowiratusazamepom.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/wexok.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_off00008173.bin
a3170155a63f4df93619cc7aa3f9811805ef376269d66b0e3857fe32a93c66cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8173 5320 bytes
font_01_sfnt_off00009362.bin
ce5742c1affce5f3a2efa2e5a173ff8059fa335fc6afe55b9063fcc70e03ec15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9362 10820 bytes

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