Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc27279e1dd2d247…

MALICIOUS

PDF

35.8 KB Created: 2020-09-08 13:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f8b3e6ec166486a89cfa179ddfe9157 SHA-1: 54c2f8de2924240c09db88f50f5c448b3df757c1 SHA-256: bc27279e1dd2d2476a155bdb1173689ce6379ebf772caede27ddac1c4bf3f800
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though garbled, contains keywords related to educational worksheets, suggesting a lure to disguise the malicious intent. The primary malicious URL is https://ttraff.me/wix?keyword=systems+of+equations+elimination+worksheet+kuta, which is likely used to funnel victims to further malicious content.

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.me/wix?keyword=systems+of+equations+elimination+worksheet+kuta
    • https://cdn.shopify.com/s/files/1/0433/8424/2325/files/nugapolapemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/3d_chess_game.pdf
    • https://static.usrfiles.com/ugd/0baf77_e8e0ba14b8f24d3286b9bb19ceba2d08.pdf
    • https://static.usrfiles.com/ugd/20d83a_68489ab5944247d78e7f6a52d87acbfd.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_d59736d74ca84fa3b4bd391797b6b94c.pdf
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/autobiographie_dfinition.pdf
    • https://cdn.shopify.com/s/files/1/0440/3360/5797/files/rinigakatewiresutid.pdf
    • https://cdn.shopify.com/s/files/1/0433/5104/8357/files/70877109271.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/printable_alphabet_worksheets_for_toddlers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5755/files/kenya_budget_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2376/files/lovolilifosesuzan.pdf
    • https://cdn.shopify.com/s/files/1/0431/3359/9893/files/free_trumpet_ensemble_music.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_off00004cd6.bin
86c642132d8f8617cbde51edd2f104c73a6ad15cea49ed30e816459731743e2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD6 5492 bytes
font_01_sfnt_off00005f74.bin
cd3bc12783afce6741cf37a8574c43cdc745556d5c20a4dd944c61ed8b7ceec3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F74 10232 bytes