Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaa3073c77b5321…

MALICIOUS

PDF

44.9 KB Created: 2020-08-30 16:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39786fccc2e19aa95a15253c8ff38de0 SHA-1: 8c88fe59b32c4b5b57659d6b211b8d8228487a27 SHA-256: dcaa3073c77b53212d1294120ecc9f051213a2cc5af6861c3d8d43b3be4ae751
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body and numerous embedded URLs, including the primary malicious redirector https://ttraff.cc/wix?keyword=dating+sim+download, suggest a lure to a dating simulation download page which likely leads to further malicious content. The presence of a large number of external PDF links, many hosted on Shopify, further supports the link farm attack pattern.

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/wix?keyword=dating+sim+download
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/catalogo_hinode_2020_ciclo_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/kagasamasajumetizesejo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8658/4733/files/latewajugiwuwilijirid.pdf
    • https://cdn.shopify.com/s/files/1/0462/6389/4170/files/24964603077.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/yayati_kadambari_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6520/files/10292241101.pdf
    • https://cdn.shopify.com/s/files/1/0438/5318/5174/files/lazuzazitefinarukerer.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3707/files/biochemistry_basics_pogil_extension_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/4237/1741/files/sifofipog.pdf
    • https://static.usrfiles.com/ugd/b8c837_62a5d968ecc846639d3de5cc1a6faf2a.pdf
    • https://static.usrfiles.com/ugd/3e87bf_622390183e014798b81ea4c2391e44b8.pdf
    • https://static.usrfiles.com/ugd/5de1df_733ab67d45da489eb77d41e0be90f7f1.pdf
    • https://static.usrfiles.com/ugd/73f3b0_0a4a8b4816254634b6bdbaa37a4cd9ee.pdf
    • https://static.usrfiles.com/ugd/4c1554_176b2d4d97f543879a103ef5370280c8.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000726f.bin
d69e983d307f60cd340c417241ac3dcbcd5c670089dd38d6c95fe6f9ed3b189e
pdf-font-stream PDF embedded font (sfnt) at offset 0x726F 5140 bytes
font_01_sfnt_off000083e6.bin
b9c27b0ee892f810d0d3b17d1fae93a5c7955eeae744ffb66e88ec8995780834
pdf-font-stream PDF embedded font (sfnt) at offset 0x83E6 10280 bytes