Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d4587d0444316a…

MALICIOUS

PDF

41.0 KB Created: 2020-08-23 01:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3764b87104eba4c62e0406289aca696 SHA-1: aa342b480e316998534141579ff80ef86a06fb1c SHA-256: 18d4587d0444316a398709fb5a3dad47b3bb743887660e83140a1f21fc9e7629
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains but ultimately redirect to a malicious URL (https://ttraff.cc/pify?keyword=check+imei+android+phone). This suggests a link farm or redirection scheme designed to obscure the final malicious destination. 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.cc/pify?keyword=check+imei+android+phone
    • http://files.gcrpc.org/uploads/1/3/0/7/130739570/togota_ronurefab.pdf
    • http://files.pinnaclehcbr.com/uploads/1/3/0/7/130774970/vuronitaka_babewinax_vizofuwafuba_tufopojetaka.pdf
    • http://files.latincruisersofphila.com/uploads/1/3/0/8/130874368/xefura_tuxodu_kifarege.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8910/7869/files/11264787268.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/remudobuvag.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/hernia_inguinal_pediatria_medigraphic.pdf
    • https://cdn.shopify.com/s/files/1/0454/4040/1566/files/free_tv_apk_for_android_tv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1029/files/gibiginuporojem.pdf
    • https://cdn.shopify.com/s/files/1/0440/1519/0181/files/hsc_result_2018_bd_marksheet_with_number.pdf
    • https://cdn.shopify.com/s/files/1/0450/1169/7814/files/history_of_english_literature_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6140/files/degujevukejazetilurokeki.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3545/files/babusan_all_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/8973/0467/files/free_10x10_storage_shed_plans.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_off000062c9.bin
24356f3c583739a6271c4b76b6dbb81534a773e977d66151ee47b73f7965f710
pdf-font-stream PDF embedded font (sfnt) at offset 0x62C9 5072 bytes
font_01_sfnt_off000073d6.bin
e5395bac9b5d677912663d66bc78830f4823c25ab05e39bca511f46ea0a130d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D6 10380 bytes