Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a8ab0d97cd3efb…

MALICIOUS

PDF

46.7 KB Created: 2020-08-26 12:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60fb6b3f6681eac229f51dafcaadf2f2 SHA-1: 2d1c8c395ed2185cdcc9b6ec2ce1ab7fd16d44d5 SHA-256: 19a8ab0d97cd3efbe7f969891748266b8bad7bcabe29172f2645a1e5c7c74f92
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to ttraff.com, suggesting a phishing or scam attempt. The document body, though partially corrupted, contains the same redirector URL and numerous benign-looking Shopify links, likely intended to obscure the malicious intent. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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=charles+mills+white+ignorance
    • http://files.ichdesigns.com/uploads/1/3/1/6/131637271/b38838.pdf
    • http://files.cluettinsurance.com/uploads/1/3/1/1/131164239/c58367b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8973/0467/files/34827695631.pdf
    • https://cdn.shopify.com/s/files/1/0434/7514/0761/files/8651495230.pdf
    • https://cdn.shopify.com/s/files/1/0432/2145/0914/files/65512312858.pdf
    • https://cdn.shopify.com/s/files/1/0437/9928/1821/files/wisujubadifon.pdf
    • https://cdn.shopify.com/s/files/1/0440/2819/9062/files/45390285998.pdf
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/installare_android_studio_su_linux_mint.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/84237762426.pdf
    • https://cdn.shopify.com/s/files/1/0448/9153/7563/files/bold_art_2_album_zip.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1387/files/silberberg_chemistry_7th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0463/4653/5073/files/how_information_asymmetry_leads_to_market_failure.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_off00007959.bin
888701799d6a63a8218cc141072e8d49831922325b0196e98d0853b8bf2a3db2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7959 5212 bytes
font_01_sfnt_off00008b00.bin
18e6be7f6029b103a698b6e4664f85122022e09c449cc4db78539e1567a93758
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B00 10192 bytes