Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0fd41dce9cee4a…

MALICIOUS

PDF

51.6 KB Created: 2020-08-07 20:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb60c76b5fb4db80ad499f4f6eb7cd3 SHA-1: 9db0fe51f71b51bfcb1ae9dae38020ccbf6eeda5 SHA-256: 8c0fd41dce9cee4ae00cd48aa41a14c3bca997a5ea0da17f0326cf9401616f57
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for users to click on it, likely leading to further malicious content or downloads.

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=agama+adalah+nasihat+pdf
    • http://files.yin-tang-therapies.com/uploads/1/3/2/6/132682701/guluzido.pdf
    • http://files.finallyfridayartandwinewalks.org/uploads/1/3/1/6/131636956/tefajela_mamom.pdf
    • http://files.standishbiblechurch.org/uploads/1/3/1/1/131164130/ligas-losixunak-budubovevisubok.pdf
    • http://files.harmonizeyourspace.com/uploads/1/3/2/3/132302913/6922088.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/adulteration_of_herbal_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/sedubuvaseleki.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/33393153187.pdf
    • https://cdn.shopify.com/s/files/1/0435/6322/1155/files/wopupimifufubidoruwugum.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1146/files/tadidenovipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7319/1588/files/lavirewukavosora.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/87701404037.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/ejercicios_just_already_yet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/vofekuragemugesepebizuso.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/alter_ego_plus_a1_guide_pedagogique.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/2003_ford_windstar_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/scientific_management_in_public_administration.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/lagajowup.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
stream_005_off00009af9.bin
233efb583a9c7238c096695ea1b7548a7647478aff6a3279e95d6814ba90723f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9AF9 22028 bytes
font_00_sfnt_off00006696.bin
395f17f3a143e56f4915f5850a7e58b8788bff3670a1d719ce40259c7436b88f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6696 5348 bytes
font_01_sfnt_off000078a3.bin
870be932fa6e86f914826adb364bd70669d3eb852313dd8f791c877161e84ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A3 9964 bytes

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