Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6d81e774f6d606…

MALICIOUS

PDF

41.9 KB Created: 2020-09-01 20:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e043f8a7f21383a8746ace1187a6580d SHA-1: 11338a7ceb39b0ee00db280e24955545723ec919 SHA-256: 9a6d81e774f6d60662b2451c9d57edb9ecc13ec5b77ff8572b9bb12cd113e9fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link to known malicious infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The primary malicious URL identified is https://ttraff.ru/wix?keyword=view+page+source+android+chrome. While no scripts were extracted, the structure and URL firings strongly suggest a phishing or malware distribution attempt.

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=view+page+source+android+chrome
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/balap_mobil_game_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/82871273052.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/aptis_listening_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/sesuxiperidosipafodotiw.pdf
    • https://static.usrfiles.com/ugd/963627_628ff5430be44bf7b3b893da90e13926.pdf
    • https://static.usrfiles.com/ugd/b8c837_d72bf1bb1da8404abea58e9d5f721bac.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc4e1d3c30f24c46a999aafbd0482c6e.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/1770570675.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/38979912867.pdf
    • https://cdn.shopify.com/s/files/1/0429/5367/0822/files/referat_orchitis.pdf
    • https://cdn.shopify.com/s/files/1/0430/3355/9203/files/le_crime_du_caporal_lortie.pdf
    • https://cdn.shopify.com/s/files/1/0434/4021/0072/files/xotava.pdf
    • https://cdn.shopify.com/s/files/1/0440/8895/0949/files/bose_soundsport_true_wireless_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/bacteria_cell_structure_and_function.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_off000064e1.bin
5acb9b1461fade7a315e37def41a81a054f09029b8275b68341b7b3018a3613d
pdf-font-stream PDF embedded font (sfnt) at offset 0x64E1 5512 bytes
font_01_sfnt_off00007791.bin
defd54144165c64c456fc17a58dd6284f25e852bfcf084ae88bf9c5d867e6663
pdf-font-stream PDF embedded font (sfnt) at offset 0x7791 10272 bytes