Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7a056b235b6eb7…

MALICIOUS

PDF

40.8 KB Created: 2020-08-06 11:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90b609111f7ce2e6567c9877fb0ee58a SHA-1: e525d50e967a6bbbdb89516975a159d21358c945 SHA-256: 6a7a056b235b6eb7e68ab4be51098f8d3157f70dbe5ac7704f11ea012782e1f0
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting an attempt to distribute content or lure users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=ayesha+at+last+uzma+jalaluddin+pdf
    • http://files.laurencegestalt.com/uploads/1/3/1/4/131482991/rarojizuzafi_wazakodufegulov_vemevobuvaxewu_zogikanezu.pdf
    • http://golipaxo.birdislandplacenciabz.com/uploads/1/3/2/6/132696414/dixevujid.pdf
    • http://files.mariebarbour.com/uploads/1/3/2/8/132815882/6cfce.pdf
    • http://fosovesa.dunlaplacrosse.com/uploads/1/3/1/6/131606552/mimuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/51380525205.pdf
    • https://cdn.shopify.com/s/files/1/0437/8014/5313/files/bokuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/youtube-_dl_ffmpeg.pdf
    • https://cdn.shopify.com/s/files/1/0445/4455/7220/files/pruebas_bioquimicas_para_e_coli.pdf
    • https://cdn.shopify.com/s/files/1/0436/8026/8438/files/8193230791.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/29707732546.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/heart_of_worship_chord_chart.pdf
    • https://cdn.shopify.com/s/files/1/0440/2174/3781/files/gonagovupejegajorujozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/70132748752.pdf
    • https://cdn.shopify.com/s/files/1/0432/0827/8171/files/53650350657.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_off00006058.bin
940039bcd37777c5d6ce53155e86f5c0ab87f001834aee278ecfcc63bf0e25b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6058 5400 bytes
font_01_sfnt_off000072af.bin
518e1823dfe74239dcf9231ed8f700d4d9a84395a5c10a5f6dbbc1639197bb71
pdf-font-stream PDF embedded font (sfnt) at offset 0x72AF 10468 bytes