Malicious PDF — malware analysis report

Static analysis result for SHA-256 17767d2ef5d625e4…

MALICIOUS

PDF

45.6 KB Created: 2020-08-22 06:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61a3c2d04ca5e8b58e68aebfd8ee08d1 SHA-1: 232ae52e1f2e8f41968d59a26460f124a133c36d SHA-256: 17767d2ef5d625e4ffa5f0438fefea15294ebae97512f7582421f30cf3aca678
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL associated with a redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure.

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=iiaba+market+share+reports
    • http://files.akashachamberlain.com/uploads/1/3/1/4/131437885/tunupesa.pdf
    • http://files.lifeofabusymommy.com/uploads/1/3/0/9/130969305/9064561.pdf
    • http://files.afrocamming.com/uploads/1/3/1/4/131438111/fepozoxezopezub.pdf
    • http://gijavuro.totalbusinesswebsitesolutions.com/uploads/1/3/0/7/130739892/ziwimewo.pdf
    • http://josilut.thetrue.org/uploads/1/3/1/6/131637016/1265662.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lojuxefututa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/mopexikuwuneluso.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/53548741490.pdf
    • https://cdn.shopify.com/s/files/1/0436/9586/6024/files/xasegamatubom.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/mobetonikatatirobagekeko.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/7075964148.pdf
    • https://cdn.shopify.com/s/files/1/0430/2517/0595/files/18457147000.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/fituw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9376/files/nafadadijaxile.pdf
    • https://cdn.shopify.com/s/files/1/0437/7133/0709/files/20_mb_to_kb.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/nesizeluxewezevijojaxuw.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_off000076f1.bin
643d967af00670981337644a6790bef2e4ce7393f4b1ddd715b0227df3692444
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F1 5168 bytes
font_01_sfnt_off00008859.bin
47ca283e95c8d84f456e0b116feceaf70bb0742750b4a6373fef473d6b16cc31
pdf-font-stream PDF embedded font (sfnt) at offset 0x8859 9628 bytes