Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddc38c78184fd72…

MALICIOUS

PDF

45.6 KB Created: 2020-08-14 08:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d0af732c09fe7489c14ea26fad19aed SHA-1: f06cb16b4b6ee7611903c21e05d2336d6c4c02f9 SHA-256: dddc38c78184fd72199238396a539777dd7f70da9ffb350654ad85aacc7d11f3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=english+verbal+ability+test+pdf', suggesting a lure for users to download further content. The presence of multiple Shopify-hosted PDF links, alongside the malicious redirector, indicates a link farm strategy to distribute malicious content.

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/pify?keyword=english+verbal+ability+test+pdf
    • http://buvatare.digitalwalestec.com/uploads/1/3/0/7/130739275/3009930.pdf
    • http://files.annymakeupwien.com/uploads/1/3/1/3/131380504/437ca004bcc4b.pdf
    • http://files.tarrantfatherhood.com/uploads/1/3/1/8/131871462/4148991.pdf
    • http://gizalu.quietcountryestates.net/uploads/1/3/2/6/132680813/lasugakogarosogerupa.pdf
    • http://files.farnhamflashfestival.org/uploads/1/3/1/4/131407361/porutizomojer_zodolu_vimujepapipiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4090/files/katogik.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6167/files/76193550482.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/basics_of_electrical_engineering_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/choosing_statistical_tests.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/68696866840.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7599/files/jopej.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/autocad_export_blank.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/bookseller_of_kabul.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/adventist_28_fundamental_beliefs.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8244/files/lalajijut.pdf
    • https://cdn.shopify.com/s/files/1/0435/7727/8623/files/grade_distribution_iu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9107/3947/files/58823753668.pdf
    • https://cdn.shopify.com/s/files/1/0435/6849/6798/files/suwusikaxirowopimi.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_off00006764.bin
ecc046313983c6fea6f15d468fb15062bf72593161157076ff548bc657ee1000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6764 5240 bytes
font_01_sfnt_off00007929.bin
ea934a8f9a0d2681da8b7e33e9b064ce51daab742b9a6c9960ae224e0c2bd13c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7929 9968 bytes
font_02_sfnt_off00009b5f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5F 4324 bytes

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