Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45c4b03cacd8228…

MALICIOUS

PDF

46.7 KB Created: 2020-09-01 14:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f8705a70c8326a99facefea9c623dbb SHA-1: be5b9dc8adf68c03d696c7683ba9990958eb0412 SHA-256: b45c4b03cacd8228ec48f336475d73481a67e8cdb334ed6c429a56ca4906b66f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. This URL is embedded within the document body, suggesting a social engineering lure disguised as 'Year 6 maths worksheets'. The presence of numerous other PDF links, many benign, indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=year+6+maths+worksheets+negative+numbers
    • https://cdn.shopify.com/s/files/1/0437/5835/4584/files/baldi_s_basics_hack_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/27458154937.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/dr_bhimrao_ramji_ambedkar_photos.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/wenelerodutofatalemibawos.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/95702141624.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6880/files/free_timed_reading_passages_for_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/xamirusugotomogivokid.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/geserokurakurupububiposad.pdf
    • https://cdn.shopify.com/s/files/1/0466/7873/7061/files/63112662530.pdf
    • https://static.usrfiles.com/ugd/0789d5_7852368d108f4685a0bf49ee0bdfbd75.pdf
    • https://static.usrfiles.com/ugd/912de2_77ad9a73689449ec9a9bd4576097b219.pdf
    • https://static.usrfiles.com/ugd/94e5ef_95c92f7d7b5f41a9a2a3e084545f2d56.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c8a9f9fdaf245c5bb33594a03a051e2.pdf
    • https://static.usrfiles.com/ugd/8e1900_daa36c84353f40ca8ca231954137974d.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/98423801093.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/45046326176.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6415/files/mafilevagipuxowutaxovok.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8929/files/django_timezone_list.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/
    • https://cdn.shopify.com/s/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007704.bin
197bddc912996fd5cce8f4eb6e71c03badcd518d44a46b4b243e0445f5511b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7704 5536 bytes
font_01_sfnt_off000089cf.bin
84a8ec52d8d42f52bc055cae64dfb74c1263b37e8286ee3ca54a93006f37b18a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CF 10372 bytes

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