Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9bdf0ecbd9a49f…

MALICIOUS

PDF

44.4 KB Created: 2020-07-18 22:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 61934ccb07d24abec7cb574e6f9e43e7 SHA-1: d01ab867ec2543b6733109d3412ab8d6240fca97 SHA-256: 7a9bdf0ecbd9a49f7bb179005d596442e46d810d438c1e2c927c4e88f255be52
194 Risk Score

Malware Insights

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

The PDF contains multiple links, including one pointing to a known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=adobe%20pdf%20reader%20latest%20apk%20download', disguised as a download for 'Adobe pdf reader latest apk download'. The document body and heuristics indicate a lure for free software downloads, a common phishing tactic. The ML classifier strongly flagged this PDF as malicious.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.cc/wb?keyword=adobe%20pdf%20reader%20latest%20apk%20download In PDF document text
    • http://files.beavercreekbaptistchurch.org/uploads/1/3/1/0/131070379/fenodof_wekis_widosoxasetif.pdfIn PDF document text
    • http://files.jamesmatthewwilson.com/uploads/1/3/1/6/131637057/d1e23bb.pdfIn PDF document text
    • http://files.theshrubberyllc.com/uploads/1/3/1/4/131454383/juzigi-gosotoguz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/sexelafikulawozuboxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/xivitowinis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/28864897207.pdfIn PDF document text
    • https://bexojasal.files.wordpress.com/2020/07/20575696060.pdfIn PDF document text
    • https://leludibowen.files.wordpress.com/2020/06/rogoxolodi.pdfIn PDF document text
    • https://rekinirive.files.wordpress.com/2020/06/801059761.pdfIn PDF document text
    • https://govizugag.files.wordpress.com/2020/06/93560740591.pdfIn PDF document text
    • https://jezowiv.files.wordpress.com/2020/06/vimup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0364/0984/files/wifusuletidimisos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5425/9606/files/tudazuzemopedafisalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3330/4993/files/rujanurisilumipan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/jalodaxelevevikevixug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31178329868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0124/2022/files/kewusenujigupisum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/wamusuzalilugaguxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodowowesibaxen.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7086 5060 bytes
SHA-256: a5ad8830c06f68bcd9340cf7f96c6a03f20502f32f8fba175c7cc6e7ba88f9c7
font_01_sfnt_off000081cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81CF 9980 bytes
SHA-256: d099c3d24c9c83078794f74813b3bc4e15fe8377813272683c660598133b9873