Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de26d77856b94d7…

MALICIOUS

PDF

47.0 KB Created: 2020-07-28 19:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fc6888acff4e1b7c8ff6340325132e0 SHA-1: 559364bb608fa648d00658d1c83d71e5d49f0034 SHA-256: 0de26d77856b94d7ba96d67d87b95450ca6833028218500a263d9fc7234df0f3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains but one specifically to a redirector URL associated with malicious activity. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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=solve+linear+equations+word+problems+worksheet
    • http://files.misssummitinternational.com/uploads/1/3/1/4/131406473/e1190777c.pdf
    • http://files.amadorrunning.com/uploads/1/3/0/8/130813427/914dc8afb5c.pdf
    • http://files.nickirutledgephotography.com/uploads/1/3/2/6/132682868/1046495.pdf
    • http://files.westfieldvictory.com/uploads/1/3/0/7/130739991/debceb4c106.pdf
    • http://files.thechronicself.com/uploads/1/3/0/8/130874189/93cd0be0c8fe0c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2176/0672/files/vemevisin.pdf
    • https://cdn.shopify.com/s/files/1/0437/0812/1242/files/14978943752.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/wutujivafivupatovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/pewuxixulisipageromumak.pdf
    • https://cdn.shopify.com/s/files/1/0430/4335/6821/files/didejiwoleraxafixep.pdf
    • https://cdn.shopify.com/s/files/1/0429/2309/8279/files/sedaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/67647153060.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/jilotiveletipufefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/53000472793.pdf
    • https://cdn.shopify.com/s/files/1/0430/9549/0721/files/39842158908.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_off00007195.bin
53ecaaeafd30de7750201cdee3f689ca174de6daf7ca1c7821bfdbe583cb1e45
pdf-font-stream PDF embedded font (sfnt) at offset 0x7195 5668 bytes
font_01_sfnt_off000084ae.bin
a5bd6d11a9ecf419fdf5fa0e75d430c8ca428712cdcd69a5b4b7d7c7a72ae3e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x84AE 13432 bytes