Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef254ba2486143c…

MALICIOUS

PDF

42.9 KB Created: 2020-08-30 14:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa5a6277bdf5fad51a87c535313fc813 SHA-1: 40f8873c12dbe956b22a011a44e1607e87582894 SHA-256: aef254ba2486143c9fa2586697d278d88b781cd12b4a2f07dcbce14540a94389
150 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 'https://ttraff.ru/wix?keyword=engineering+mechanics+dynamics+8th+edition+download'. This URL is presented within the document body, disguised as a link to download an academic textbook. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to benign Shopify domains. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=engineering+mechanics+dynamics+8th+edition+download
    • https://static.usrfiles.com/ugd/b8c837_7bcc34a0377846cb9b108c067d771ad2.pdf
    • https://static.usrfiles.com/ugd/3dd68e_b96705f9043a4abebe5905453fc8b378.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e85fd2285534310a5655e8580de0c0b.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_061483e34bbb4545b95748aa5b86010e.pdf
    • https://cdn.shopify.com/s/files/1/0432/9383/5432/files/duwesux.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2717/files/print_to_macro_word.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/nivukimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7777/9100/files/ncert_biology_class_11_new_edition_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/16099665682.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/74795272981.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/averages_and_range_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0462/6389/4173/files/jejux.pdf
    • https://cdn.shopify.com/s/files/1/0433/4498/6280/files/ajahn_chah_biography.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/77646139995.pdf
    • https://cdn.shopify.com/s/files/1/0430/5377/7047/files/argumento_deductivo.pdf
    • https://cdn.shopify.com/s/files/1/0439/0230/4408/files/51480848694.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48465164240.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/riwaroxegolafiwejuduso.pdf
    • https://cdn.shopify.com/s/files/1/0440/1646/8133/files/nedaxelanetagibumobowu.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_off00005c5b.bin
23242f7a8433823de0d4a2c0df14cf1349e0583b22fda035049ae85ae3411015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5B 5488 bytes
font_01_sfnt_off00006edf.bin
1be79aa52ee3c27390b201f5ae51cb3942ecd951bac248f17a482ec683a9fedd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDF 9692 bytes
font_02_sfnt_off00009002.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9002 4324 bytes

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