Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b70a0df2332377c…

MALICIOUS

PDF

47.1 KB Created: 2020-08-22 10:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218a17511b08ff6fbbe737a4574ad5cc SHA-1: ed6136c0324bb7ba93f20946d3f04bea502fbd6a SHA-256: 5b70a0df2332377cb1494a5487b573c9387bf79b36ac5464a37adcfe825a28d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading software. The presence of numerous embedded links, many pointing to Shopify, suggests a link farm or content-spinning operation. The ML classifier also 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.ru/pify?keyword=cheat+droid+pro+apk++free+root
    • http://files.westcoastminitruckers.com/uploads/1/3/0/7/130775537/2096428.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/pme_event_wakeup.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/49871775291.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/23204418200.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/misax.pdf
    • https://cdn.shopify.com/s/files/1/0441/4459/1000/files/liduwotifudubijifudamokez.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/22495293252.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85947343199.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4840/files/how_to_collapse_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9030/files/32365427545.pdf
    • https://cdn.shopify.com/s/files/1/0436/5526/6457/files/simplifying_algebraic_expressions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/biwovavufefibosakenokedi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065f4.bin
ab88071d1821b274a00129b26a46c90a5bd819d8f4ec7cd758a0f0ea3c8d7796
pdf-font-stream PDF embedded font (sfnt) at offset 0x65F4 4888 bytes
font_01_sfnt_off0000768e.bin
40ca93fbbd8fce01837d994ae23191df2122f9cc1a14d8c85581cf7682d33c8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x768E 10344 bytes
font_02_sfnt_off00009a21.bin
b7f82d2f7553557e0e94bae4fbbfa034f866ab56970e2f6ca5ebdbc13b4b5e5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A21 16264 bytes