Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1947dafb64173cd…

MALICIOUS

PDF

49.4 KB Created: 2020-08-31 08:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c99cbf6a9d7832ba80b046d1f0efd04f SHA-1: a6e18b8a2a279b5d7274fedf17de6a8b55798cce SHA-256: f1947dafb64173cd08c8b8e24880848ff62a643e4d632fa7d4824655690bc813
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a high ML classifier score and the presence of a link to known malicious redirector infrastructure. It also contains a large number of embedded links, suggesting a link farm for SEO manipulation or to distribute further malicious content. The document body contains garbled text and URLs, reinforcing the malicious intent.

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=secret+window+secret+garden+novella
    • https://static.usrfiles.com/ugd/b8c837_0430d59fc6b84d73877ca041e394734c.pdf
    • https://static.usrfiles.com/ugd/b8c837_709a31ecfa7e47c988565941733deeed.pdf
    • https://static.usrfiles.com/ugd/b8c837_1da48d54109c46d7999633c552ef3fab.pdf
    • https://static.usrfiles.com/ugd/74c34a_c630fcab94b04e21b07e847d045262fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_20cd28342c4c4789b321a1bce7b0533a.pdf
    • https://static.usrfiles.com/ugd/b8c837_82eff5da619c43febc61b3dbc129ae41.pdf
    • https://static.usrfiles.com/ugd/2ac701_6d8143ad81854d958aa633c6a71b9b0b.pdf
    • https://static.usrfiles.com/ugd/529dbf_c4c62d3ba21a4ba090f2e15a94677293.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_ba84cb819db2493a83f4dbc51b01b5fa.pdf
    • https://static.usrfiles.com/ugd/432b07_1fa5fe28ddbe430ba460db43c767ef47.pdf
    • https://static.usrfiles.com/ugd/c3f88d_00283a3087a446b38380fe2b3287f702.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc29d997332d4c2399494376c25d3128.pdf
    • https://static.usrfiles.com/ugd/be19e1_70c3f5f22da94c5ca8533beafca929c3.pdf
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/kenojemogofiwofuvawali.pdf
    • https://cdn.shopify.com/s/files/1/0428/6464/0159/files/bonjour_tristesse_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7722/files/38610204802.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/kovudoratatabi.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_off0000836e.bin
66a929795838c62241604382bf6fb72fb3efe8fd934fb8ef36fe1f592c557df7
pdf-font-stream PDF embedded font (sfnt) at offset 0x836E 5360 bytes
font_01_sfnt_off000095c6.bin
01c186674e97e39cbe8e8c136a73282f4fc6dc0c5b1ed848de9f35b6dd01d2b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x95C6 10032 bytes