Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce08e8458ef5e797…

MALICIOUS

PDF

48.4 KB Created: 2020-08-30 13:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd06d65053f209ecbf6179d0e1cd481f SHA-1: 8d4d50321c7758584ad517211ccb7e8eda0afee8 SHA-256: ce08e8458ef5e797bcd6d92bebc7516f772b73d13d511be0d20adb0e222ca299
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on shopify.com. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting an attempt to lure the user to a malicious site under the guise of educational 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.ru/wix?keyword=exercice+g%25C3%25A9om%25C3%25A9trie+dans+l+espace+3%25C3%25A8m
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/dabimeruwiloruviro.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/pekoterotiw.pdf
    • https://cdn.shopify.com/s/files/1/0436/8557/6857/files/upload_to_kindle_cloud.pdf
    • https://cdn.shopify.com/s/files/1/0432/0971/9965/files/luzejasuxizolaxenivom.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/alman_dili_qrammatika.pdf
    • https://cdn.shopify.com/s/files/1/0429/2752/1948/files/munijaritotejivudeluvar.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/biwiso.pdf
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/musuxadome.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/75375362318.pdf
    • https://cdn.shopify.com/s/files/1/0437/3757/9674/files/mijasoluzafejijatubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4375/files/87297650719.pdf
    • https://cdn.shopify.com/s/files/1/0430/7245/4810/files/9500947211.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006422.bin
cf6500dee11c09197b575b7376de67d1fcad477701c8c9b811c34b4bb3cee6e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6422 5864 bytes
font_01_sfnt_off00007766.bin
e31aa2049c7df378142cd86ad1ecf6f0271df958ff0347de99ceb01b0b3f8b92
pdf-font-stream PDF embedded font (sfnt) at offset 0x7766 11732 bytes
font_02_sfnt_off00009d5b.bin
f12bcc42cb143e9cc41a08ef9f9c81c8a36c017982c073a20263204097028d61
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D5B 16100 bytes