Malicious PDF — malware analysis report

Static analysis result for SHA-256 1348a4f01e950c2c…

MALICIOUS

PDF

55.5 KB Created: 2020-09-10 13:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daf29effdf238f80ea1b3cd17beeb3f2 SHA-1: 2b735801de3766375276edaf2b76804ac7e23c07 SHA-256: 1348a4f01e950c2c3566fcd032f1f01146a08d5145cc5750efaf018decd64ab3
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by the presence of a mass external PDF link farm. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. The ML classifier also strongly indicated maliciousness. The presence of a 'download button' lure suggests an attempt to trick the user into initiating a download or navigating to a malicious site.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/wix?keyword=english+worksheet+for+class+5+cbse
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0113/4747/files/49735618275.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/ibm_spss_amos_26_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/aggression_and_violence_in_adolescence.pdf
    • https://cdn.shopify.com/s/files/1/0432/7958/1352/files/ruwewolivixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7946/files/voninelazo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2777/files/rujetosokirepivoguv.pdf
    • https://cdn.shopify.com/s/files/1/0438/2654/4797/files/pdf_to_word_converter_software_download_filehippo.pdf
    • https://static.usrfiles.com/ugd/e1a791_26744c0b5ddb43a1aed288b048c37cde.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef0bdfac639a456da29e0718d0907d03.pdf
    • https://static.usrfiles.com/ugd/3c2e2e_f1f4ce09f4914454a1567ac2dbed1182.pdf
    • https://static.usrfiles.com/ugd/23e9be_b13ff0802dd64fb4b2d237502343faa5.pdf
    • https://static.usrfiles.com/ugd/3c9ac1_b87f751a5beb4d619dc2bd1268524340.pdf
    • https://static.usrfiles.com/ugd/e1d12c_e3471a74b2d84d5cbc05bd2954e14e84.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bb8.bin
9eda97cc0138de796e8d1c57765891421e7e8266f9fe94484b1bec7b8f826b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB8 5520 bytes
font_01_sfnt_off00007e8e.bin
20cc4dfd5dbbf3820330b72de64f2c176cc528799433e9762ab6806667b8c60b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8E 7144 bytes
font_02_sfnt_off000092aa.bin
956dd3d765b9e7be56520734436143b5c5e26f7ea4d29f492cf3a59194812160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AA 10552 bytes
font_03_sfnt_off0000b6df.bin
459bc91fdd7ab87ea9ebc1797b1a3b948737d9d3234b6cc534cb86313abda916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DF 17492 bytes

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