Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e776439d52c7d53…

MALICIOUS

PDF

40.6 KB Created: 2020-08-15 08:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d51912a1ca313f62cdf21f91c26b499f SHA-1: 39f89d5784651aca8bcc84fddab290f5dc10f7f4 SHA-256: 5e776439d52c7d53e25c0ea6fa18462a4cb3245b63c13540de312bcf3533f50b
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external links, suggesting an attempt to drive traffic to malicious sites. The presence of a 'download button' lure further supports a phishing or scam attempt. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lead the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wb?keyword=free%20printable%20pictograph%20worksheets%201st%20grade
    • http://tajozebu.stateofappalachia.org/uploads/1/3/1/1/131163635/xuwuwumakedalimetuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/76154822306.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4373/files/kizekepisotuzomejolile.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/16284649933.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/38043612219.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/25599807287.pdf
    • https://cdn.shopify.com/s/files/1/0451/7157/2885/files/apnea_of_prematurity.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81858120772.pdf
    • https://cdn.shopify.com/s/files/1/0430/5492/3925/files/kubiwuzavebuzugid.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/43204169101.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_off00005f17.bin
22bdb8dc868144d9246b112f7a282f4d1e440d0afdd6a784a34cc790c0000750
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F17 5636 bytes
font_01_sfnt_off0000723a.bin
f019a343d777a74989f6ac4c4710e1aff63021fac52ddc53b6ef61bf009b94d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x723A 10352 bytes