Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ae1841fc8a5aef…

MALICIOUS

PDF

52.7 KB Created: 2020-08-22 18:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea26eac6274321151c3544a72bbeb5cf SHA-1: 87a354b096f47f6aa7866ed8378e12cbb2b3d20a SHA-256: 18ae1841fc8a5aef173c7f4f81391c74cf2421aab900d6936ffeed19d2c7a521
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'adb interface driver windows 10 free', suggesting a lure to trick users into downloading potentially malicious software. The 'SE_CLICKFIX' heuristic further indicates a social engineering attack designed to prompt users into executing commands, aligning with the observed malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=adb+interface+driver+windows+10+free
    • http://files.prestige614.com/uploads/1/3/0/7/130775970/d475791af.pdf
    • http://files.live-for.org/uploads/1/3/0/7/130738752/wigalotorogufotata.pdf
    • http://ketag.michaelschunke.com/uploads/1/3/2/8/132814930/gogusotolejemem_tuxovisabeluli_nenosewesus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/winosolatikutanuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/zirejatanero.pdf
    • https://cdn.shopify.com/s/files/1/0433/9361/3989/files/tijow.pdf
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/jafiguwumuzodedakixuvod.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/sinikagikefen.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/terminal_commands_mac_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/1908/9566/files/ibm_cognos_tm1_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/alternative_energy_sources_reading_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/food_hygiene_practices_among_food_vendors.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6796/files/josarop.pdf
    • https://cdn.shopify.com/s/files/1/0428/5169/6796/files/button_cutting_game.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nipexaledova.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_off000069fa.bin
a54bb334c9ae7eea2b8bbb507eb8daef8e5c248a026ff0d191344fbb4939ef09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FA 12324 bytes
font_01_sfnt_off000090a0.bin
f6eebc6f6a1995bf80dfd5bb663f4b5265e62d86c5e19c90bd4186dbaeb81063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90A0 5456 bytes
font_02_sfnt_off0000a34d.bin
aacaab9701d2bfe73cf8cd5f888c317282610c3062645dbf40742af637c7d26a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA34D 9972 bytes

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