Malicious PDF — malware analysis report

Static analysis result for SHA-256 369e91c07e1a8c24…

MALICIOUS

PDF

42.4 KB Created: 2020-08-21 19:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e72e4591a363bc638cf5265f09a8700 SHA-1: fd8f58055b2372fe243a61e4d345a64aa731228b SHA-256: 369e91c07e1a8c24a103b9d7f1f39ea4495c68c9bb5854dacce4df24f97f4f2d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a malicious redirector link disguised as a calendar template, which is designed to lure users to a malicious site. The ML classifier strongly indicated maliciousness, and the PDF structure includes a large number of external links, many pointing to Shopify domains, likely for SEO manipulation to improve search engine ranking for malicious content. 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=ms+excel+weekly+calendar+template
    • http://files.onesourcemobilehc.com/uploads/1/3/1/3/131383649/dasubajusasumilapa.pdf
    • http://files.maggiecjohnson.com/uploads/1/3/1/3/131381519/wulonivajik_mirafamiv.pdf
    • http://files.heart2heartknittingfiberarts.com/uploads/1/3/2/8/132814611/susufiku_gofunolune_tasitabukulije.pdf
    • https://cdn.shopify.com/s/files/1/0431/3186/3202/files/fekobexi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5632/files/13678319947.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/lesokuxejijopimojis.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/gadunalaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/30567918191.pdf
    • https://cdn.shopify.com/s/files/1/0438/8811/5867/files/fidexuwogibewonavawipap.pdf
    • https://cdn.shopify.com/s/files/1/0428/5464/5916/files/74004355134.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92313200312.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/vozitajowijinomumizaze.pdf
    • https://cdn.shopify.com/s/files/1/0435/0902/2886/files/41926914460.pdf
    • https://cdn.shopify.com/s/files/1/0429/5124/5987/files/69448447789.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_off000067ef.bin
b528ad119125a6b328785c80f39c797f5cf99ea0c214cb38fb75304f0c04f5e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x67EF 5552 bytes
font_01_sfnt_off00007add.bin
638e7124a19998f7c95baa3d2be94f30460106d70ac73ca637343815f527d0f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADD 9944 bytes