Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae276c3a065026a2…

MALICIOUS

PDF

44.8 KB Created: 2020-08-12 21:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6b245d9350caa9d800f6dc8d3f7b91e SHA-1: 1cb41c1568d86e97b9de7be1637cff49fbf80357 SHA-256: ae276c3a065026a2a8feda22c79ad58426b4a39923b64ab45757b07df1778696
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as educational content. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms the intent to lead the user to harmful 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/wb?keyword=making%20bar%20graph%20worksheets%203rd%20grade
    • http://jusokered.daaaromania.org/uploads/1/3/0/7/130775195/8727183.pdf
    • http://legaxox.samsungrepaircenter.net/uploads/1/3/2/8/132814930/4675099.pdf
    • http://files.eastafricanscholarsfund.org/uploads/1/3/1/6/131606968/dafixuxozonono-foxidi-xinatajejed-poloxokawuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5176/files/54582226989.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/87827744899.pdf
    • https://cdn.shopify.com/s/files/1/0430/4306/1913/files/pejabozexazamemusefajojej.pdf
    • https://cdn.shopify.com/s/files/1/0437/2601/2567/files/naruto_path_of_the_ninja.pdf
    • https://cdn.shopify.com/s/files/1/0431/6466/3967/files/meningitis_bacteriana_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0433/4334/7877/files/4911091518.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7539/files/9450338440.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5341/files/complications_of_meconium_aspiration_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/35392912493.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/34377875770.pdf
    • https://cdn.shopify.com/s/files/1/0435/2416/1695/files/80871019429.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b92.bin
4c7f293a4d266abdadf53f93a76f17aef1e11dd21f051fba03cd85281ac4f3de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B92 5652 bytes
font_01_sfnt_off00006ed6.bin
76fa52a22a953c107e6fa7f4d6fe327d7dae9301699f372b663eaf7890674ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED6 10132 bytes
font_02_sfnt_off00009168.bin
bf1970bc7489ebbf475166aaabd28a1b8412b766423f1868e7f6d21597619aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9168 16080 bytes

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