Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a2dc1f5a32e17c…

MALICIOUS

PDF

40.8 KB Created: 2020-08-15 05:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 806851dda7e26a305a2d94ea9c49433c SHA-1: 3c9b04ce33e208400f8c4cfb821a06c7921d5904 SHA-256: 03a2dc1f5a32e17c24dd7bebfbddbb4c024fe161fe05fc84019951da3c8365b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. This suggests a link-farming or redirection attack designed to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=simple+past+tense+exercises+regular+verbs+pdf
    • http://velapu.usovaolga.com/uploads/1/3/0/8/130874422/5260983.pdf
    • http://files.mccormickmasonry.com/uploads/1/3/1/4/131455024/6545330.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0452/5981/7117/files/xirarunetutuzes.pdf
    • https://cdn.shopify.com/s/files/1/0438/0868/6237/files/doriwisemazepuzum.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/digezarexiwopagagug.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/ancylostoma_duodenale_y_necator_americanus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0607/4780/files/venilenusexa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4933/files/nozovodeza.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1109/files/vimazoriruvulisugen.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/get_out_movie_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/83060170477.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/bidasesik.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ad8.bin
87598da32d75359afa90aa4676f0420bef5a6b0432e83c842cc2d51728029c7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD8 5844 bytes
font_01_sfnt_off00005e9a.bin
54f45702b42222551d4c76ce92155268a7bdbee6de3652c4c739daa76c4cc661
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9A 10100 bytes
font_02_sfnt_off00008169.bin
bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8169 16060 bytes