Malicious PDF — malware analysis report

Static analysis result for SHA-256 5beebd2e6d4b7098…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 07:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d041e3fa16a11facfe74b08b63ae13f9 SHA-1: e34c2ca99d2f5400d974c2040cf5f2a32c02ac3a SHA-256: 5beebd2e6d4b7098a07156daeb43a66d331655db033cfd087079c9bba66f6684
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one identified as a redirector to malicious infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting an attempt to distribute content or lure users to various sites. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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/wix?keyword=acumed+distal+radius+spanning+plate
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/4154/4599/files/total_war_attila_campaign_mods.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/12999059953.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdf
    • https://cdn.shopify.com/s/files/1/0434/3119/8886/files/75985871183.pdf
    • https://cdn.shopify.com/s/files/1/0431/6158/3776/files/amidah_prayer_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6060/files/ascend_performance_materials_houston_tx_77002.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/arrays_in_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0454/7497/1798/files/canzoniere_napoletano_chitarra.pdf
    • https://cdn.shopify.com/s/files/1/0435/7334/6463/files/algebra_1_final_exam.pdf
    • https://cdn.shopify.com/s/files/1/0466/4990/1221/files/descargar_bet365_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0436/9874/9608/files/14156229299.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/11428532095.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1568204463.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/inorganic_chemistry_atkins_download.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_off0000600e.bin
78a1f17dadaed070202fed234dece3b76e54c244d3c28266a956e54b2c743ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600E 5152 bytes
font_01_sfnt_off00007170.bin
ac95177e942cc7e82161a4b98396cf29fef5ba24ff367c8bcaee867c840c6567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7170 11016 bytes
font_02_sfnt_off00009545.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9545 4324 bytes

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