Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a936e837bfd6899…

MALICIOUS

PDF

50.8 KB Created: 2020-08-27 13:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a7d6c0246c714717c3c686531f6cf79 SHA-1: 4590d0a0e2417b8658ba3cc48281d37ff0e15202 SHA-256: 1a936e837bfd68994484433447d66624bf8db61219574fbbe5b3a6d092162a8b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=gate+rory+mercury
    • http://files.wattsdidierarchitects.com/uploads/1/3/1/0/131070911/gitabomujuxikenapoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1674/8188/files/33725537308.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/how_to_install_stress_on_amazon_linux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/fekizozepopusuvomonar.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/42232152405.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/66634759947.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8707/files/rugimixuwadumidavabuzal.pdf
    • https://cdn.shopify.com/s/files/1/0435/2799/5552/files/36562499071.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/sivizifexovagedelaxonoxet.pdf
    • https://cdn.shopify.com/s/files/1/0438/2231/7728/files/android_sdk_root_tool_on_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0431/4451/1645/files/gadufupin.pdf
    • https://cdn.shopify.com/s/files/1/0428/0752/5542/files/60147863014.pdf
    • https://cdn.shopify.com/s/files/1/0447/9811/6006/files/median_from_a_frequency_table_worksheet_tes.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_off000056fa.bin
823dec3552f9f1e613ba3834a241d290cd03fe40f60db5de255fc60528d9fe3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56FA 3324 bytes
font_01_sfnt_off000062df.bin
00ac218ef6d9dd1c3bb7ef999c94a8594e4598c192b5563428c41a2c010f1893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DF 4868 bytes
font_02_sfnt_off0000735a.bin
ff95b1d673811f2341cf9f981d53efadd773d79fdd921fb57a79f0042ccf74da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735A 1980 bytes
font_03_sfnt_off00007cb3.bin
e931398f9d7a770581724aa2e0bc1d5c435e971818a8522f7875d548f46cd087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB3 11304 bytes
font_04_sfnt_off0000a13d.bin
0d4b9c5d58980b69835781fbf5aab154126c99644319b478dc10e21a62f33401		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA13D 17708 bytes

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