Malicious PDF — malware analysis report

Static analysis result for SHA-256 845771dce1a9a91b…

MALICIOUS

PDF

80.9 KB Created: 2020-09-02 17:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d432469e3ab1ed66324e87e68ec0c8b4 SHA-1: f003f77fec2010a1a9c6f9abbb63cf2f54bbab0c SHA-256: 845771dce1a9a91b2d839cef6341e3177eada03050accead17117f7e1bcd619d
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result, which redirects to the malicious URL https://ttraff.ru/wix. This URL is flagged as a known malicious redirector. The PDF also contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness.

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=biografia+de+agatha+christie+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2194/9335/files/i_be_on_yg_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3921/files/boss_monster_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/33659577139.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/aambala_tamil_movie_song_masstamilan.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/47790148498.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9750/files/bristol_stool_chart_nhs.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9909/files/utorrent_location_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/8436/3416/files/cannibal_ferox_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/fuzogiganax.pdf
    • https://cdn.shopify.com/s/files/1/0433/3358/2998/files/kobisaxupesuxejapegugez.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/46490363271.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/administracion_de_recursos_humanos_mondy.pdf
    • https://cdn.shopify.com/s/files/1/0439/5443/8302/files/samolulurirudakixone.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8988/files/20812453556.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_off0000ffbc.bin
cee904547ed02526e82df09f4cba1b8bbb6b2898420f65747deca0525d788fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 5432 bytes
font_01_sfnt_off0001123a.bin
ed63e9725f1aca812b0ba62ce92537650cb741a2940419c035d59228bfc47b5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 10632 bytes