Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a7405055ead627…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 20:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 281f62c855a4ca67297f0b38cb75c6cb SHA-1: 682ec387e2653dff250a49a2e36b3334de89d9d8 SHA-256: a3a7405055ead62787dd4c893bc1b2fe85a02d9485f2ab656ffa0e3c492b6155
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link pointing to 'ttraff.ru', which is associated with a game-related lure. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to Shopify-hosted PDFs. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering via a deceptive link within the document.

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.ru/wix?keyword=game+spotlight+room+escape+mod+apk
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/wesur.pdf
    • https://cdn.shopify.com/s/files/1/0464/7052/9192/files/71379503048.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/glencoe_geometry_chapter_7_quiz_2_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/1358/5566/files/sexinoxofokikakosizej.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/sofifarusoxulinulik.pdf
    • https://static.usrfiles.com/ugd/07ef24_f0bb1394baed474ebd10f332595a2b58.pdf
    • https://static.usrfiles.com/ugd/7598fa_4c21d1444d13482e959d98c505c04685.pdf
    • https://static.usrfiles.com/ugd/7baf93_99b460eaa9e0430486e18e18cbd2bebe.pdf
    • https://static.usrfiles.com/ugd/df4650_d0f25077a42d4d509c493b3bc428b98a.pdf
    • https://static.usrfiles.com/ugd/b7306e_190044c763c343608c13d582644fff17.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4a1241efb154e09aea32844d3733e53.pdf
    • https://static.usrfiles.com/ugd/6da380_7c14be2dd1ec49ecadb411081bc75e44.pdf
    • https://static.usrfiles.com/ugd/0cd019_73c60f92b8fb4a77994c07c73d51584b.pdf
    • https://static.usrfiles.com/ugd/99965f_2809cc30ce73429ea8cd106a42a9d93e.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc2df725d53a4123ae0e48095199d0fb.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_584d5868f86242bdb77af81195443e61.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_off00006141.bin
23f16360df8f1f5e0fac9581dba5d7a15193d33ddf6e3e2eb931ba075dbb04d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6141 5264 bytes
font_01_sfnt_off0000732d.bin
11be16d12ab389445d080e16d0f1b02fef5e614956846e3f07d7556d01bbb676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732D 10364 bytes
font_02_sfnt_off000096c3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C3 4324 bytes

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