Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cefc18b517e9dba…

MALICIOUS

PDF

38.6 KB Created: 2020-08-15 00:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a07b74da26696bb7111ac694efbed1a SHA-1: 30a32f82382fc3eb9db7e7c8d98f6b2489dc885f SHA-256: 5cefc18b517e9dbaae5db0750cbe7599a6632342db7bdef72763f5d56b8e3aef
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged the PDF as malicious. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to lure users to external content. The presence of many links, including to Shopify, indicates a potential link farm or SEO manipulation tactic, possibly to hide malicious activity.

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/pify?keyword=apple+logo+picture
    • http://rafogi.jclvision.com/uploads/1/3/0/7/130739826/desazisotegisorow.pdf
    • http://files.alphakappa32.com/uploads/1/3/0/7/130775888/mibojemumidisizuvera.pdf
    • http://wusujit.brendabronnertv.com/uploads/1/3/0/8/130813765/8141888.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/8357968648.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/zowigejaxidid.pdf
    • https://cdn.shopify.com/s/files/1/0437/0789/1877/files/ziguduxepitemajad.pdf
    • https://cdn.shopify.com/s/files/1/0437/1388/8405/files/best_tinkers_construct_materials.pdf
    • https://cdn.shopify.com/s/files/1/0432/5195/7923/files/dagokubomixufisokusudalux.pdf
    • https://cdn.shopify.com/s/files/1/0436/2223/6320/files/9365816636.pdf
    • https://cdn.shopify.com/s/files/1/0433/6048/5541/files/59504910008.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/48430369915.pdf
    • https://cdn.shopify.com/s/files/1/0435/5080/2081/files/become_a_better_you_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4076/files/rodukawubugukeluvudu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/66578308027.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_off000059cf.bin
0ccc9be91e303620ea79224d77ce82ccb941f7318a73eb6965e627dff60b19c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x59CF 4700 bytes
font_01_sfnt_off000069e3.bin
7bf4aafa910106a548dc040b8726506fbb56e3dd6d96fcbb1d596b3a90ac653f
pdf-font-stream PDF embedded font (sfnt) at offset 0x69E3 10676 bytes