Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fef8969b88e62ba…

MALICIOUS

PDF

45.1 KB Created: 2020-08-31 16:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 242e52bbc53fcb49d4d117d1d391914c SHA-1: df0421c7a10a003bb1c8f3e48e8190865c903626 SHA-256: 0fef8969b88e62ba401a2a116993ef4603de5f8049b08eb7039c469fbc3b4499
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which are part of a link farm designed to improve SEO. One prominent link, disguised as a Minecraft download, redirects to a malicious URL. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or malware distribution attempt.

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/pify?keyword=minecraft+free++for+pc+java+edition
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/1151/0170/files/dirosokaba.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/boletim_de_ocorrencia_sc.pdf
    • https://cdn.shopify.com/s/files/1/0433/8673/2707/files/92355553788.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3715/files/ziwezekejimawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/vesovilamutipojanexide.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/60300008526.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0450/files/kindheit_Einlauf_Missbrauch.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/28902154442.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/pudukepafot.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/mazda_cx_9_reviews_consumer_reports.pdf
    • https://static.usrfiles.com/ugd/217d68_ce7e3a996bca4ce8acd0934ca2fb2a55.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bfe05a77a1b4d5eabd0d05d04a283b4.pdf
    • https://static.usrfiles.com/ugd/07e02c_55474e83ff7d4fcf82f69ff17d11e1e1.pdf
    • https://static.usrfiles.com/ugd/de60da_609a4542854641cf8edd1524ee55e7c7.pdf
    • https://static.usrfiles.com/ugd/0cd019_d62e9d7905a34d76b919a91e3e3b243d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1b405fb8ba84b7eadd8756f7b612aad.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000720e.bin
670f58eb68649f5cdbe3a08c40786ca326bb7dbaa5fa78e7d5c43671b1dd6e03
pdf-font-stream PDF embedded font (sfnt) at offset 0x720E 5080 bytes
font_01_sfnt_off00008385.bin
7704a266aaef267e0f07916b8d006b4d4e1e2584712fe53382ce313707652888
pdf-font-stream PDF embedded font (sfnt) at offset 0x8385 10536 bytes