Malicious PDF — malware analysis report

Static analysis result for SHA-256 da71ec54cab5d663…

MALICIOUS

PDF

69.9 KB Created: 2020-08-02 12:39:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e324fd00c21b3c9ca26666b0e9394913 SHA-1: f4335943162d1fa842003f6777e975720a6bbb79 SHA-256: da71ec54cab5d663ea1f23e840226c715178119b5092a5eac096cc50a72d2d1d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily corrupted, contains text referencing 'The dark knight screenplay' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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=the+dark+knight+screenplay
    • http://files.orangeeducationfoundation.org/uploads/1/3/1/8/131872079/2356455.pdf
    • http://files.tandem-cyber-solutions.com/uploads/1/3/0/8/130813846/2e73fec.pdf
    • http://files.artandhonor.com/uploads/1/3/0/7/130738622/disipojobop.pdf
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/form_mv-_82.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/matamabufixemujiriwikiji.pdf
    • https://cdn.shopify.com/s/files/1/0437/4013/5575/files/mevafetagetejavoruradu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0432/9753/8203/files/219306564.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/29761496966.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/88192080687.pdf
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/81361973977.pdf
    • https://cdn.shopify.com/s/files/1/0432/3989/9304/files/mamilexilemude.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/sonemufuxopifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3262/5831/files/kaiji_ultimate_survivor_episode_1.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_off0000d369.bin
ccdcd0d88867f11d09d4dd36e508d00b75b3d2d84baf6f1b7fcdc4eef5a364e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 5448 bytes
font_01_sfnt_off0000e5fa.bin
8295143e6987f005e96ec9cd2055428c1e72ea0785941e3ce3c9cf6cc1f70efd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 10436 bytes