Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d4d83828fdb119…

MALICIOUS

PDF

54.6 KB Created: 2020-08-05 08:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b8929f772badd9d4c8946dd10ba2a1c SHA-1: c09c68d03dd13f43c32508314d0aecae6489a587 SHA-256: 90d4d83828fdb11955e717ada6b862b1cae2ec045ae72053450e7a00dad4afbd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm or phishing lure. The primary attack pattern involves luring the user to click on these links, which then likely lead to further malicious content or exploits.

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/wb?keyword=indirect%20speech%20structure%20pdf
    • http://files.we-have-hope.com/uploads/1/3/1/4/131406582/bobebozo-vapuragito-potezodijazup.pdf
    • http://files.cantornote.com/uploads/1/3/2/8/132814977/vobuwadefi.pdf
    • http://files.elginowl.com/uploads/1/3/0/7/130739789/tobexefigifaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/zidif.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7151/files/java_se_binary_stopped_working_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/48849787894.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/16010766600.pdf
    • https://cdn.shopify.com/s/files/1/0433/6972/6110/files/nimetapej.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/35360586457.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/wuvitabujapukajavowomi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/29750053400.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0428/files/4406636949.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/zajatelutitujazada.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutiga.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9782/files/64271308693.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_off00008f7d.bin
dfdfc4a9479cf2ab2ad5161fc967625f7e8b6f09bd480ac6d5ff6dd69f2ce3bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7D 4936 bytes
font_01_sfnt_off0000a046.bin
372b9a017ae706af6297a74cd2080ca27734529d39645f2a833ee042015d22c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA046 15780 bytes