Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d58b43d001d1af…

MALICIOUS

PDF

34.9 KB Created: 2020-08-14 09:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 254b41596de175e0622a5b40dc6788f0 SHA-1: fe7e8014d697914e50dd1920182acb33578f010f SHA-256: 97d58b43d001d1afb42f621523bfd871d2154997f10f9d337145cea040eaeb01
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=topographic+map+worksheet%2523+2+answers'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, including 'https://cdn.shopify.com/s/files/1/0434/7641/8722/files/capitalization_worksheets.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious 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.ru/pify?keyword=topographic+map+worksheet%2523+2+answers
    • http://files.theekklesiacenter.org/uploads/1/3/1/4/131453034/6382104.pdf
    • http://files.classofwestk.org/uploads/1/3/1/1/131164032/2039583.pdf
    • http://vakolubap.refresche.net/uploads/1/3/0/8/130814106/logapodorugajaxag.pdf
    • http://files.raunmackinnonburnham.com/uploads/1/3/0/7/130775893/furepovorowem-nuwafewunaxulam.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8722/files/capitalization_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0445/8224/0420/files/78001988311.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/80363650869.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/beautiful_thing_suranne_jones.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/painter_s_algorithm_in_computer_graphics.pdf
    • https://cdn.shopify.com/s/files/1/0430/5305/6149/files/8475143223.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6208/files/plastic_memories_episode_1_gogoanime.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47171602999.pdf
    • https://cdn.shopify.com/s/files/1/0449/4213/1355/files/this_masquerade_carpenters_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/bojen.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_off00004dcf.bin
81d5d7f3336913c74d3fcaa37adfce353a8c78c2943a173797955521f1b12d17
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DCF 5420 bytes
font_01_sfnt_off0000602b.bin
d76bd54d6420421e0354cc918379fd08f69b86f7b4b127c6e39fa20336e06d68
pdf-font-stream PDF embedded font (sfnt) at offset 0x602B 9060 bytes