Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae03ca2082e0278…

MALICIOUS

PDF

32.9 KB Created: 2020-08-17 12:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7383bae26c5cd0c9c82964b247b27e23 SHA-1: 9087774bd5277daf1d0a0623fd0fe141a544114e SHA-256: 6ae03ca2082e0278c3161b7791517154746abb806c798cda3fa31753ed94b73f
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for a 'zip file' and includes the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links, many pointing to Shopify, suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=bangla+album+song+zip+file
    • http://bozid.whmercantile.com/uploads/1/3/2/6/132695829/6763965.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0899/1142/files/xenumozilawuz.pdf
    • https://cdn.shopify.com/s/files/1/0447/9716/5728/files/score_sheet_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/35949180284.pdf
    • https://cdn.shopify.com/s/files/1/0439/4542/7102/files/bromination_reaction.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/lowix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5185/9611/files/bulletin_de_salaire.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/51878922872.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5765/files/53261542121.pdf
    • https://cdn.shopify.com/s/files/1/0437/3089/4999/files/jurnal_skripsi_akuntansi_sektor_publik.pdf
    • https://cdn.shopify.com/s/files/1/0434/7160/1817/files/94019367868.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/56857835897.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/72888141101.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_off000041ea.bin
f8212a937215f9fcca85e16ed0477f422575454565268ee12b52e4682b80e1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41EA 5364 bytes
font_01_sfnt_off00005421.bin
7c1969304a4a15c46e494399941a9eab6857640323806f0b89261bdfeb79ab50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5421 10248 bytes

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