Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8f1c14fbdcccab…

MALICIOUS

PDF

49.4 KB Created: 2020-09-07 02:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6c84f4950449005658ffb19aaf108104 SHA-1: bd83e0782d7cc004040e356196841f50679aa900 SHA-256: bd8f1c14fbdcccab7f33c9a0c07be086ded33391d3589f9533d3657e88bef787
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'letter paper design templates' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=letter+paper+design+templates In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7509/3159/files/dirif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/55723991675.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1654/2632/files/lerojobokumosafug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4526/5312/files/misifilasup.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5be868_175aa2c30a4e48479a2343413cb71a03.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/83f04e_7695de20d6324c0287df902c6b440a3b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0809/7445/files/papapojibipawel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/49520995225.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0154/3830/files/holy_bible_catholic_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/4190/5829/files/disuvewakiwakafevilised.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8312 5220 bytes
SHA-256: 5b91017ae79105998a0462584ac213f594f99aa3998c15fd8b614b2858d6cdcf
font_01_sfnt_off000094bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94BD 10648 bytes
SHA-256: f10c06ddb40fbc439f06e2a157e65ff8b721f7ba2662dfb196cd97627c467960

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