Malicious PDF — malware analysis report

Static analysis result for SHA-256 087e4df6ba8aac80…

MALICIOUS

PDF

65.7 KB Created: 2020-08-01 19:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2a7d5139ab7358e5ba8809b226793fe SHA-1: 4f90e41a015b01e736a87238de8d2f64f8d1b151 SHA-256: 087e4df6ba8aac80566369bbb7c3221d21365e315aedfcb7809ab0e59b8038a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to redirector infrastructure like 'ttraff.ru'. This suggests the document is designed to lure users to external sites, potentially for malicious purposes. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=2014+nba+finals+stats
    • http://files.3spellcastersandadwarf.com/uploads/1/3/2/3/132303245/6dde349de83c96.pdf
    • http://files.d-dcrafts.com/uploads/1/3/1/6/131606876/b3056d9743707.pdf
    • http://files.florencejoelle.com/uploads/1/3/2/7/132741241/raguwi_serinata_penorafefof_jisuxutud.pdf
    • http://files.weddingphotoscyprus.com/uploads/1/3/1/3/131379543/a5e4ba6d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9932/3558/files/36517097123.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/goxakazewudu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/povumad.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/movaxetutoxuve.pdf
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/27195494600.pdf
    • https://cdn.shopify.com/s/files/1/0432/0254/3778/files/31930873418.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9160/files/23785259409.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/15610094502.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/lexirijopumixarakap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugifewelogukepebokiz.pdf
    • https://cdn.shopify.com/s/files/1/0436/3455/7088/files/62360782228.pdf
    • https://cdn.shopify.com/s/files/1/0433/9489/1943/files/xulubivodusesetotopu.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_off0000b621.bin
338a321b3e330183ab4b56b33f099c2e23c76424a45dd6eec6b296cef248b5fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xB621 5124 bytes
font_01_sfnt_off0000c7ae.bin
3d7cb78de301c113805a28f2aca77e096b80f3ab4df6bc6459557d8c12ea648b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 16616 bytes