Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a171e9bc2cc4dbc…

MALICIOUS

PDF

49.0 KB Created: 2020-08-23 21:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 450df723bf8fdac74ea08b3fa240c99a SHA-1: 4b6381114addf2f7edc85f92fb3611d06f6dea23 SHA-256: 0a171e9bc2cc4dbc1bee40b1a293713fa7ea73fc2965c21ff8b9d7e324b04b83
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a link farm heuristic further suggests an attempt to manipulate search results or distribute malicious content. The ML classifier also strongly indicated 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/pify?keyword=cambridge+1+listening+test+2+answer
    • http://gepej.yogadiversityinitiative.org/uploads/1/3/1/4/131437261/laroli_pezogijavamu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/netbeans_java_gui_builder_tutorial_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9658/8967/files/auditing_notes_bcom_3rd_year_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/41556734652.pdf
    • https://cdn.shopify.com/s/files/1/0430/1081/8201/files/laundry_symbols_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/adobe_reader_for_linux_ubuntu_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/4179/0871/files/canales_de_distribucion_mercadotecnia.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/velatoxixevixubilobamev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/watelajijur.pdf
    • https://cdn.shopify.com/s/files/1/0439/0273/0408/files/zutepexukurameropibafumu.pdf
    • https://cdn.shopify.com/s/files/1/0441/1876/9816/files/munilobidiriguwugeduf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007275.bin
1ece4a7f43fb1a0dce93d4cd9fbead803132428f2b471798d4510610fdbebed4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7275 5264 bytes
font_01_sfnt_off00008452.bin
aa4a4380b5ff9ada80e00777ca8fa0328521735d998e0d79cfafc490ca5487c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8452 10580 bytes
font_02_sfnt_off0000a876.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xA876 4324 bytes