Malicious PDF — malware analysis report

Static analysis result for SHA-256 427cee10c91699ee…

MALICIOUS

PDF

56.3 KB Created: 2020-08-18 13:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2e5dd4aa3663315283b2531f19d061f SHA-1: 502698a5e6c478a6c64e6c4c0195b67dee3762de SHA-256: 427cee10c91699ee885cc916237cc15df08d2bc6bdb4cf22895beff319d33302
152 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, but one critical link directs to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the text 'ncert mathematics textbook for class 4 pdf' and the malicious URL, suggesting a lure to download potentially harmful content. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=ncert+mathematics+textbook+for+class+4+pdf
    • http://rofowu.vjcompu.com/uploads/1/3/0/9/130969656/2994931.pdf
    • http://files.cathhowe.com/uploads/1/3/0/7/130775050/juxobudokuxa.pdf
    • http://gejev.thecatandthecrystal.com/uploads/1/3/1/4/131483468/tufunaburajikuk.pdf
    • http://files.losacres.com/uploads/1/3/1/3/131380651/jigumig_rofovurubo_buferan_jajife.pdf
    • http://files.homesweetfarmschool.com/uploads/1/3/1/8/131857723/vuzowilosaxurap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/xabuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/20345680413.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1077/files/gijabilun.pdf
    • https://cdn.shopify.com/s/files/1/0430/4109/5834/files/gta_5_sound_board.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7137/files/vutibuwuvapol.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1391/files/12815578430.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/74736103429.pdf
    • https://cdn.shopify.com/s/files/1/0435/4621/4564/files/treble_booster_app_for_android_phone.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ce.bin
de485b6812c797c1f4e777841f4bcb6722cb274d7b172f02a57240b4379c91ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CE 5724 bytes
font_01_sfnt_off00007516.bin
06917b0f29e6e0af92136f79cb02c75d9f6bb30eea93e32521e20bcd29437ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7516 6964 bytes
font_02_sfnt_off000088e8.bin
ddf25d3a0a04f40934a2577bf54a2ec9761373fcfc813e5fc90e3842c7a32363		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E8 10440 bytes
font_03_sfnt_off0000acac.bin
c1e6ffc75750c5739b28184ea098192487e1c360ff13057a509a4a6bbbe05e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACAC 17492 bytes
font_04_sfnt_off0000c639.bin
2db595101c9b6b0655095ead38e23a82a83f17680823a71040747b6541cd477b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC639 3232 bytes

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