Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa9f7c57ef4d783…

MALICIOUS

PDF

54.3 KB Created: 2020-08-28 14:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b7e0026d12762bace25eaef32df5f81 SHA-1: 6e51edcd3ca851a530f99926a9ebc5677b07439d SHA-256: 9fa9f7c57ef4d783ec20501e83000e6644fa2b304120df86ab8347e20dda94bd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to a redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=mathematics+solver+apk', suggesting a lure for users seeking a mathematics solver application. This indicates the primary goal is to redirect users to 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.cc/pify?keyword=mathematics+solver+apk
    • http://files.fumctupelo.com/uploads/1/3/2/7/132741555/381037.pdf
    • http://files.miniwanderers.co.uk/uploads/1/3/0/7/130776042/7990256.pdf
    • http://popixe.soilandsun.co.uk/uploads/1/3/2/3/132303320/6088485.pdf
    • http://files.packtenna.com/uploads/1/3/1/4/131482930/4181662.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/42833071670.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/57728517127.pdf
    • https://cdn.shopify.com/s/files/1/0435/0260/0356/files/buvigo.pdf
    • https://cdn.shopify.com/s/files/1/0447/3903/5290/files/32699681311.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/podigefopip.pdf
    • https://cdn.shopify.com/s/files/1/0429/8312/9251/files/5967602184.pdf
    • https://cdn.shopify.com/s/files/1/0437/7640/9751/files/fusionner_plusieurs_page.pdf
    • https://cdn.shopify.com/s/files/1/0430/9870/1977/files/53889415007.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0392/files/xokijo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/73917148960.pdf
    • https://cdn.shopify.com/s/files/1/0440/4704/0662/files/winrar_64_bit_windows_7_crack.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059d7.bin
b5af3bddd8a91eabb9a822c377f0dcfa472880db53e4538526e77c64c7584ebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59D7 5304 bytes
font_01_sfnt_off00006bbc.bin
0beb40604760a69a347bf9982eca2a812fc455045be72e23bd738b9504f7d17e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBC 9088 bytes
font_02_sfnt_off000084e0.bin
a61e3a39893f6197ca6f65dfec9ebb901bd3dda59f168158546a0a13a9176fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E0 14352 bytes
font_03_sfnt_off0000b159.bin
6cc52de95992728658e3d647a4fac2252261d26d925447a9b7c24c4419cb3f65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB159 17016 bytes

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