Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57792590bb8f1af…

MALICIOUS

PDF

40.5 KB Created: 2020-08-29 12:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f999bca5e81462b0e6274493dd33a7b6 SHA-1: edc3c0bdb5a19b1d2d66867293adeff9cb7dea3e SHA-256: c57792590bb8f1afd93b1113d2c1ed9a39fb793d43dc95689cc134c5e6412f16
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded external links, with one pointing to a known malicious redirector. The document body contains a URL that is also present in the heuristics, suggesting a deliberate attempt to lure users to a malicious site. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=cole+phelps+doubt
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/78006487540.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2332/files/belanjawan_johor_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/7993/3862/files/xokokiberibizivowana.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/nicet_level_2.pdf
    • https://static.usrfiles.com/ugd/b8c837_47bf84b640f6426cb4871c64fbd75f2b.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7555/files/merit_badge_worksheet_personal_management.pdf
    • https://cdn.shopify.com/s/files/1/0432/0650/8701/files/how_to_get_rid_of_discord_bots.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4675/files/zosexidepir.pdf
    • https://cdn.shopify.com/s/files/1/0440/4323/9589/files/61424190024.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/bemodiparifadik.pdf
    • https://cdn.shopify.com/s/files/1/0434/5738/0514/files/barron_s_ielts_strategies_and_tips_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/8th_grade_math_word_problems_printable_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/6762/1028/files/chirutha_songs_free_telugu.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_off000062ee.bin
a63166d7052024c15f7580a944f556824fda719ffc25aa4d9a5b5903fa47c6e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x62EE 4784 bytes
font_01_sfnt_off00007322.bin
10dc1e72201c37f904094c61935328b88fcd9a70ff49f0943fed1cd21938d45e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7322 10164 bytes