Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eff1714a82fdc98…

MALICIOUS

PDF

41.9 KB Created: 2020-08-01 19:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1f4fd5ac6eef857e90becfa309a4560 SHA-1: 7816be8145cd4a348de7a4787ba71fae45bf6cb1 SHA-256: 4eff1714a82fdc98b6b61cb028824869206a0469369d85cb95228ad8e6829943
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 one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains a reference to the malicious URL, suggesting the primary purpose is to lure users to malicious sites. No scripts were extracted from this sample.

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/pify?keyword=central+time+zone+abbreviation
    • http://files.knappd.net/uploads/1/3/1/4/131452878/radupepalap.pdf
    • http://files.hattiecooper.com/uploads/1/3/1/3/131383330/tiwakuvewo.pdf
    • http://files.stevendupuisoil.com/uploads/1/3/1/6/131606349/lulaxiwisode.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/8403309238.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/mizanuzotelukelixugik.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/22439981072.pdf
    • https://cdn.shopify.com/s/files/1/0437/6965/9549/files/leah_remini_troublemaker.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/xigisixikupowititifotit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7219/1641/files/81645248637.pdf
    • https://cdn.shopify.com/s/files/1/0431/5240/8742/files/givupovekilivesuvoxom.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/vavubibus.pdf
    • https://cdn.shopify.com/s/files/1/0432/2348/2525/files/duzubozogogubajepijepozaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/bibusorixevivagezakinoxon.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/widenivizofidapi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2091/0746/files/gazafirisatewovel.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_off00006865.bin
25d31eea2584933677beafc3a9daac4480ea5bce199a51fb2eebb3e3c2d9b70a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6865 4808 bytes
font_01_sfnt_off000078b5.bin
7d8884e32ec00bb9bc15c5985ea6da4d42f73228edc281ee62476b3b1f2097a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x78B5 9964 bytes