Malicious PDF — malware analysis report

Static analysis result for SHA-256 4785b15f9282af6d…

MALICIOUS

PDF

42.1 KB Created: 2020-08-09 06:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 223b9db14761db32e874e24491671570 SHA-1: e0a43ac1ad4ef58a09cf9647eb7f83e6a1494d2d SHA-256: 4785b15f9282af6d76bdfeefb9022c3bba7156b9244f409691c85c0c5f555733
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary malicious redirector identified as https://ttraff.ru/pify. This URL is associated with a link farm designed to distribute SEO-optimized PDF files, likely as a lure for users searching for specific content. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a malicious redirector.

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=california+math+expressions+grade+5+volume+1+answer+key+pdf
    • http://files.isaiahsixeight.org/uploads/1/3/1/8/131871424/fc5785.pdf
    • http://files.andrewbarnettjones.com/uploads/1/3/0/9/130969680/4e6251931ee.pdf
    • http://files.ingwersenforhouse10.com/uploads/1/3/1/6/131607075/xamolatokowemejiniju.pdf
    • http://files.nikkidudleywriter.com/uploads/1/3/1/1/131164476/sobumutunupunon.pdf
    • http://files.nehb.net/uploads/1/3/0/7/130739557/ac2cb225b6807e9.pdf
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/85195174776.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/54649465833.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/6769028676.pdf
    • https://cdn.shopify.com/s/files/1/0434/2674/2421/files/mavovekude.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/kelavipederozogegesozaxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9305/5904/files/16397163139.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/pajigixupun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9182/files/41671098204.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/nodufatukivufiwonovap.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4502/files/wikavonagajajirukesepelol.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/avoid_node_modules_in_github.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/66679504353.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_off0000638d.bin
a6c1e37f846daf2483cc3711ffc353bf138557c6e788ba41e80c37ef4b7c309a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638D 5924 bytes
font_01_sfnt_off000077af.bin
2410bf6cf11f50b7417563afd1691c8a83503902ec8faef29be45b2dbd332ced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AF 10344 bytes

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