Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eea93fb0d1fefac…

MALICIOUS

PDF

51.2 KB Created: 2020-10-17 16:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6d530bb118b7b090de13af2173bd8e8 SHA-1: 19b83fec7d22ab3bfa070fd6868e71af4cddc86f SHA-256: 3eea93fb0d1fefac0d35df66f9dbfd7d02ee2a506a3587fbed538a7b89f63822
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.club/123?keyword=free+handwriting+worksheets+for+2nd+graders, which is presented within the document body as a lure for free worksheets. The ML classifier also strongly indicated maliciousness.

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.club/123?keyword=free+handwriting+worksheets+for+2nd+graders
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5f89f1ce90fa4.pdf
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f87c4ccc5d5d.pdf
    • https://cdn.shopify.com/s/files/1/0481/9795/9837/files/tekubukasiraji.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0530/files/career_development_plan_assistant_professor.pdf
    • https://cdn.shopify.com/s/files/1/0428/6929/3215/files/flammable_cabinet_regulations.pdf
    • https://cdn.shopify.com/s/files/1/0488/4008/1573/files/micro_business_environment.pdf
    • https://cdn.shopify.com/s/files/1/0496/7206/1092/files/digigogojozuro.pdf
    • https://cdn.shopify.com/s/files/1/0483/1766/1347/files/49073883713.pdf
    • https://uploads.strikinglycdn.com/files/49f1964b-83ef-4fb4-b7cc-dbaea41b86c1/pixizuguwe.pdf
    • https://uploads.strikinglycdn.com/files/62b436c9-cf42-4619-a06b-8d06c20ee01e/42460607401.pdf
    • https://uploads.strikinglycdn.com/files/85f50f4b-9771-434f-9d13-da737c2cf383/senipevofudox.pdf
    • https://cdn.shopify.com/s/files/1/0434/1507/7022/files/27819403457.pdf
    • https://cdn.shopify.com/s/files/1/0483/3293/1235/files/bilalurisuguluwowekame.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6564/files/.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/que_hora_es_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0482/5805/6346/files/visonic_alarm_engineer_manual.pdf
    • https://uploads.strikinglycdn.com/files/8bb90841-0da8-43da-85e1-5eaefab7b4c4/66292302510.pdf
    • https://uploads.strikinglycdn.com/files/540d8244-448a-49ad-9b34-3a13fd12e78e/mekuwekuxironoramepiwoke.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/1/0482/5805/6346/files/visonic_alarm_engineer_manu

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00009496.bin
d871e4e3f58bcdfdae15ddbc68359d9d1bbf37ea4e5da398c839a1f4956b9fb7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9496 18196 bytes
font_00_sfnt_off00006064.bin
00cd969fd0ea01dbbc8a5386bae1f6781cc76ebf03672070e84edd21b1adaf43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6064 5168 bytes
font_01_sfnt_off00007202.bin
18c4bf78f31d4fa7cde3d98adf8a0c2eb44077093cbe60f6b3ee45538b53eb5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7202 10024 bytes
font_03_sfnt_off0000b097.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB097 4324 bytes

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