Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc674358d2a88c65…

MALICIOUS

PDF

56.2 KB Created: 2020-08-15 01:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3268f8e9409b71a60fbfe34f04f98051 SHA-1: e2e7db5e45962926694b45d92ad8aa89fc8b3fec SHA-256: bc674358d2a88c6501610eedef683271012341171b90e6e25e4d95c76cebf8a4
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. A critical heuristic identified these links as pointing to a known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=my+ambulance+thai+drama+eng+sub'. Another critical heuristic indicated the PDF hosts a link farm, with many links pointing to 'cdn.shopify.com', likely to obscure the malicious redirector. The document body contains garbled text and embedded URLs, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=my+ambulance+thai+drama+eng+sub
    • http://files.zanegerringer.com/uploads/1/3/0/9/130969545/7387973d1f11.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/97696743566.pdf
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/rugologuwozobekizut.pdf
    • https://cdn.shopify.com/s/files/1/0432/1538/8840/files/59276446717.pdf
    • https://cdn.shopify.com/s/files/1/0437/3004/3041/files/ap_statistics_multiple_choice_released.pdf
    • https://cdn.shopify.com/s/files/1/0452/4569/4112/files/al_quran_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/betekapeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/ms_word_course_syllabus_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0285/files/spare_the_dying_cantrip.pdf
    • https://cdn.shopify.com/s/files/1/0440/8960/6294/files/bawamebiligawis.pdf
    • https://cdn.shopify.com/s/files/1/0437/1375/7339/files/28802660817.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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00006d2b.bin
90d8fb7e1751ec6730168582c731f0305bae9695c78ef252b9bb437e1360a365		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6D2B 7620 bytes
font_00_sfnt_off00004b5a.bin
c5636ae666dead40bf87c71003620c73e91d85fc6e838f169e560fe73215c3de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B5A 5372 bytes
font_01_sfnt_off00005d63.bin
cfbf460bc26f06bbbbc59955c3717ccc210c98b570dac4bea79c638e2d9bf869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D63 4104 bytes
font_03_sfnt_off00008231.bin
ced5195df52e99cf0e611867e6f550b9bd9d1720693b774edc61fdb13cace482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8231 9992 bytes
font_04_sfnt_off0000a485.bin
95f8549a757aee844ec28bf606b6967ba64910cd336bf0f6e4cf65bd850cca33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA485 17636 bytes
font_05_sfnt_off0000bcf5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF5 4324 bytes
font_06_sfnt_off0000caa9.bin
5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 1736 bytes

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