Malicious PDF — malware analysis report

Static analysis result for SHA-256 1559c78c9e210f1e…

MALICIOUS

PDF

40.3 KB Created: 2020-08-30 20:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25553fce5d45a80bef5e1aad98187394 SHA-1: 04de749c21b301c8ee1f40eeb4ed5f5aababd45b SHA-256: 1559c78c9e210f1eb891edfee0d1e58d5244f64729bba3898e0849a157c9c21a
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a direct link to a known malicious redirector at https://ttraff.ru/wix?keyword=happy+sindani+dead. The document body itself is heavily obfuscated and contains this malicious URL, indicating an attempt to lure the user to a potentially harmful site.

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/wix?keyword=happy+sindani+dead
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8597/8013/files/66478311184.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/first_grade_math_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/nifezowonabakegema.pdf
    • https://cdn.shopify.com/s/files/1/0429/7962/3071/files/22691708583.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3690/files/anatomy_for_sculptors_understanding_the_human_figure_ebook.pdf
    • https://static.usrfiles.com/ugd/b8c837_741b7f6a61d14d2093375e09dc85b30b.pdf
    • https://static.usrfiles.com/ugd/078c79_25fe05fb907d4d42b4ef1ed3b1098f1d.pdf
    • https://static.usrfiles.com/ugd/54fa57_dd125b77ec3f4b7b8b1bf58aee3d3965.pdf
    • https://static.usrfiles.com/ugd/b85eb0_b53f6624ebfd4ad98d4cccb6b47b1955.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ff37e4a526f42fd805e670bfd6c74ac.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/58436396367.pdf
    • https://cdn.shopify.com/s/files/1/0434/6180/4197/files/32777738883.pdf
    • https://cdn.shopify.com/s/files/1/0432/0742/6216/files/80988217669.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_off00006157.bin
a70a5a75e66768d0890f1fb19ae1e88cf0860aa2fa9446f3c7f99e040ccd99ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x6157 4888 bytes
font_01_sfnt_off0000720d.bin
9c5d86941420c1364af398b64518c0a9fd11497eccd2790845e0f10b36047d9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x720D 10424 bytes