Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e4b93021cc1999…

MALICIOUS

PDF

47.0 KB Created: 2020-08-19 07:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b723ea5ee951678a0c31c4ab8a21070 SHA-1: 0297be7f5aba1a3cf0f89cef7da2bbb9ad2b56ec SHA-256: 16e4b93021cc1999d083145ea3d0f5a4ee0875ec845b106325f3bb95e9366c93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests an attempt to lead users to malicious content, likely for phishing or malware distribution. 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.cc/pify?keyword=marbleslides+rationals+answers
    • http://files.russellsproutsofsunnysideschool.com/uploads/1/3/0/7/130740591/gifuwo.pdf
    • http://puvogin.thesteelweb.com/uploads/1/3/2/8/132815172/acfe6085a36.pdf
    • http://files.keepafallenstar.com/uploads/1/3/0/9/130969889/6385142.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/54409430053.pdf
    • https://cdn.shopify.com/s/files/1/0436/6611/2662/files/62276164431.pdf
    • https://cdn.shopify.com/s/files/1/0438/1255/2864/files/aka_in_a_sentence.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9638/files/kirimasurejimavedosikes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/3491024687.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/juxifu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0787/4984/files/jumaduba.pdf
    • https://cdn.shopify.com/s/files/1/0431/2658/7549/files/90957402367.pdf
    • https://cdn.shopify.com/s/files/1/0438/7504/1435/files/format_painter_google_sheets_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/3977/6159/files/11718298481.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/lekisulujitokanegumifu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3823/6062/files/48110214807.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/gowadoxovomufizevu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/causes_of_stress_essay.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_off00007ab2.bin
3abaa22bfda61f99815c80da7ccb23fee33ccfa234e770d8e0c49df8fd741492
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB2 5056 bytes
font_01_sfnt_off00008c04.bin
1c6fcbff6361f9fa125dd216880cd006849d74f005be726330c39515e17006db
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C04 10388 bytes