Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd97509d33d6ec39…

MALICIOUS

PDF

46.5 KB Created: 2020-08-31 05:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3360a255987edda944cd08ccafadf1a9 SHA-1: 3e7d5f0a16fcfa6e6be0fcbe90e1a2c5356da5fb SHA-256: dd97509d33d6ec390a1f3806207e3dd76d242cd4027307bfe4ce31ede46f52dc
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which are benign Shopify URLs but one is identified as malicious. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a 'Montreal underground city guide'.

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/wix?keyword=montreal+underground+city+guide
    • https://cdn.shopify.com/s/files/1/0433/9279/4774/files/pravana_vivids_mixing_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/ccna_data_center_study_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/wofujonetewugomexirek.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/minecraft_gendustry_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/8384/2215/files/nasuvakaxuponiketidobeba.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/92311541301.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/50671796766.pdf
    • https://cdn.shopify.com/s/files/1/0430/9080/4893/files/53179077014.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/nutoverigi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7507/6258/files/lg_google_account_bypass_tool_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59577082877.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/81301326048.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/lowes_russellville_ar.pdf
    • https://static.usrfiles.com/ugd/b8c837_50317b7ffffb444385c759f666e40a19.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_59009c621fed4b5db40bcf464c94c98a.pdf
    • https://static.usrfiles.com/ugd/69695d_f0ecd7db66ea47c692bda7a0d8b49b03.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_off000067bb.bin
0e474232a8f0648fdd74f4d5c9a92d6b0adb9053e87086aadc74ab46ac1f8ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67BB 4920 bytes
font_01_sfnt_off00007889.bin
d983374162838b5b5520bcad87fa645df38d523b93797d32c8cdd7de603fa20a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7889 10688 bytes
font_02_sfnt_off00009d06.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D06 4324 bytes

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